Make error pages responsive

## What does this MR do?

This MR makes error pages responsive design and all users have better experiences on 404/422/500/502/503/in-deploy error.

## Are there points in the code the reviewer needs to double check?

n/a

## Why was this MR needed?

404/422/500/502/503/in-deploy error pages were designed only for PC and not good for mobile users.

## What are the relevant issue numbers?

Closes #19345

## Screenshots (if relevant)

### PC
![improved-404-lg-v3](/uploads/280f48f95bd446888a81cc2150877cd8/improved-404-lg-v3.png)

### mobile

(with `max-width: 40vw` for `img` (@connorshea) and `max-width: 800px` for `hr` (@annabeldunstone) )
![improved-404-xs-v3](/uploads/9764aac3992dedb6b437045943a07fe5/improved-404-xs-v3.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5000

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Resolve "Empty project page does not show Repository section on navbar after creating first branch/file"

This MR aims to fix the rendering of the project's page after creating a README/LICENSE/.gitignore and creating the first branch of the project on the website.
Pictures related with the problem this MR fixes linked in #20025

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

Closes #20025

See merge request !5399

Project and branch cache is expired when project is still
empty or new branch is created. develops tests accordingly
Signed-off-by: Rémy Coutable <remy@rymai.me>

Optimize maximum user access level lookup in loading of notes

See merge request !5412

Resolve "Remove routes that we do not use anymore"

_Originally opened at !4059 by @strzibny._

- - -

## What does this MR do?

> I tried to clean up the routes as mentioned in #14584
I used the following script and manually verified the changes: https://gist.github.com/strzibny/4ccbda7dcf67ef6719dcb047014e1ea7
After this patch, the script still gives me the following routes:
Unused routes (7): oauth/authorizations#show doorkeeper/tokens#create doorkeeper/tokens#revoke oauth/applications#edit oauth/applications#show doorkeeper/token_info#show omniauth_callbacks#(?-mix:(?!))
Here is a relevant code from doorkeeper on drawing these routes: https://github.com/doorkeeper-gem/doorkeeper/blob/5ea4575863781940fe6996692c6b41f2ad71d90e/lib/doorkeeper/rails/routes.rb#L25

## What are the relevant issue numbers?

Closes #14584.

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)


See merge request !5499

Update gitlab-shell version to 3.2.1 in the 8.9->8.10 update guide

## What does this MR do?

Update gitlab-shell version to 3.2.1 in the 8.9->8.10 update guide (missing from gitlab-org/gitlab-ce!5509).

See merge request !5516

Signed-off-by: Rémy Coutable <remy@rymai.me>

This was missing from gitlab-org/gitlab-ce!5509.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix typo in Elixir CI template



See merge request !5514

[ci skip]

Add ENV variable to skip repository storages validations

Closes #20124

See merge request !5478

Fix missing schema update for 20160722221922

20160722221922 was merged in 8.10.1 but the schema.rb was not updated.

See merge request !5512

NotesHelper#note_editable? and ProjectTeam#human_max_access currently
take about 16% of the load time of an issue page. This MR preloads
the maximum access level of users for all notes in issues and merge
requests with several queries instead of one per user and caches
the result in RequestStore.

Return request profiling info when a header is passed

## What does this MR do?
It allows returning profiling info (instead of actual content) when a certain header is passed

## Why was this MR needed?
To facilitate having a performance overview of certain requests.

## What are the relevant issue numbers?
https://gitlab.com/gitlab-com/infrastructure/issues/211

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [ ] ~~API support added~~
- ~~Tests~~
  - [ ] ~~Added for this feature/bug~~
  - [ ] ~~All builds are passing~~
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5281

Fix a bug where forking a project from a repository storage to another would fail

## What does this MR do?

Fix a bug where forking a project from a repository storage to another would fail.

## Are there points in the code the reviewer needs to double check?

No

## Why was this MR needed?

If you have a project in storage_a, change the default storage to storage_b, and attempt to fork said project, the import will fail.

## What are the relevant issue numbers?

Closes #20302 

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
- [ ] Merge https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/75, publish the tag, and update `GITLAB_SHELL_VERSION`


See merge request !5509

Remove inline scripts from import pages.

## What does this MR do?

Removes inline scripts from the Import Status pages for all the importers we have.

## Are there points in the code the reviewer needs to double check?

That this doesn't break anything (it didn't when I tested it!)

## Why was this MR needed?

Inline scripts are bad, this removes a few of them.

## What are the relevant issue numbers?

#18231 and #19866

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5283

Make branches sortable without push permission

## What does this MR do?

Make branches on the branches page sortable without push permission.

## Why was this MR needed?

Sorting branches (a readonly action) required push permission which does not make sense.

## What are the relevant issue numbers?

fixes #18678

## Screenshots

### Before

![before](/uploads/d77d0be2599481b815cb2ef1f9c33a15/before.png)

### After

![after](/uploads/edbcf9d5ec4b2650866742ead0c2c1ed/after.png)


See merge request !5462

Instead add data attributes to a JS hook element on every import status page.

Resolve "Commits graph has overlapping text on mobile"

Apply responsive design for labels on Commits and Continuous Integration graphs.

## What does this MR do?

Make the labels on Commits and Continuous Integration graphs smaller for mobile devices.

## Are there points in the code the reviewer needs to double check?

Graphs should not break at any screen size.

## Why was this MR needed?

Labels overlaps each other on mobile devices.

## What are the relevant issue numbers?

Fixes #18846 (but also fixes a similar bug on Continuous Integration graph).

## Screenshots (if relevant)

Before:

![Screen_Shot_2016-06-21_at_23.15.29](/uploads/acbbb8d751a2192595a61804d09868d9/Screen_Shot_2016-06-21_at_23.15.29.png)

After:

![Screen_Shot_2016-06-21_at_23.04.57](/uploads/ab7607901c3ae07d2c2d3e25e83de901/Screen_Shot_2016-06-21_at_23.04.57.png)

## Does this MR meet the acceptance criteria?

- ~~[ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added~~
- ~~[ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- ~~[ ] API support added~~
- Tests
  - ~~[ ] Added for this feature/bug~~
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

cc: @jschatz1

See merge request !4841

Upgrade database_cleaner from 1.4.1 to 1.5.3.

This includes support for Rails 5 without deprecations warnings. Working toward #14286.

Changelog: https://github.com/DatabaseCleaner/database_cleaner/blob/master/History.rdoc#153-2016-04-22

See merge request !5505

This includes support for Rails 5 without deprecations warnings.

Changelog: https://github.com/DatabaseCleaner/database_cleaner/blob/master/History.rdoc#153-2016-04-22

Show release notes in tag list

## What does this MR do?

Two things in one! Ensure that a tag's message having an invalid UTF-8 byte sequence doesn't cause a 500, like at: https://gitlab.com/bitcubate/node/tags?page=9 (The problem tag is https://gitlab.com/bitcubate/node/tags/v0.1.0)

Also ensure that the release notes are actually shown on the tag index, like they are supposed to.

## Are there points in the code the reviewer needs to double check?

There's not much, so all of it.

## Why was this MR needed?

The tags index was broken in two ways.

## What are the relevant issue numbers?

Closes #20233 but does more than that.

## Screenshots (if relevant)

Before:

![image](/uploads/5456fcc70f02794570762e6ed9c6d863/image.png)

After:

![image](/uploads/0329bf93e0f1be2417e500e924bc775d/image.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- ~~API support added~~
- Tests
  - [x] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5503

A release's tag reference is just the name of the tag, not the entire
tag object.

This also fixes the tags index if a tag's message contains non-UTF8 byte
sequences.

Rescue Rugged::OSError (lock exists) when creating references.

## What does this MR do?

Rescue an exception on concurrent scenarios. I was able to create a spec for this, because if you create the lock file before trying to create the reference the reference is created without a problem and the lock file is removed. So IMHO there is a race condition where more than one process is trying to create the same reference at the same time raising the exception, so I just added the patch without specs.

```ruby
    it "attempting to call keep_around when exists a lock does not fail" do
      ref = repository.send(:keep_around_ref_name, sample_commit.id)
      path = File.join(repository.path, ref)
      lock_path = "#{path}.lock"

      FileUtils.mkdir_p(path)
      File.open(lock_path, 'w') { |f| f.write('') }

      begin
        # No exception is raised because the lock file is removed at some point in the process
        repository.keep_around(sample_commit.id)
      ensure
        File.delete(path)
        File.delete(lock_path)
      end
    end
```

## Why was this MR needed?

## What are the relevant issue numbers?

Closes #20156

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- ~~[ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- ~~[ ] API support added~~
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)


See merge request !5497

Add branch or tag icon to ref in builds page

## What does this MR do?
Add branch or tag icon to ref in builds page

## Why was this MR needed?
It's currently missing but should be there

## What are the relevant issue numbers?
Closes #20139 

## Screenshots (if relevant)
<img src="/uploads/fb5c9a285a1ce95c0aa8dfa5e32c5d7d/Screen_Shot_2016-07-22_at_9.14.39_AM.png" width="400px">


See merge request !5434