Resolve ""CI configuration" button when `.gitlab-ci.yml` is present"

## What does this MR do?
Adds `CI configuration` button to project overview page

## What are the relevant issue numbers?
Closes #20101

## Screenshots (if relevant)
![Screen_Shot_2016-07-28_at_11.51.32_AM](/uploads/499d942d203d287ae98b7589ef12673c/Screen_Shot_2016-07-28_at_11.51.32_AM.png)



See merge request !5558

Remove outdated notes from the update guide

## What does this MR do?

updates guides

See merge request !5624

fix runner install link

## What does this MR do?

Fix link to GitLab CI Runner installation

## Why was this MR needed?

Link is broken

See merge request !5612

Revert "md5 and utf_encode js libraries"

## What does this MR do?

Remove two unused JavaScript libraries (`md5.js` and `utf8_encode.js`).

## Why was this MR needed?

Those libraries were not used anymore:

```
$ find app/ lib/ -name '*.js' -exec grep --perl-regexp --with-filename '(md5|utf8_encode)' {} \;
app/assets/javascripts/lib/utils/utf8_encode.js:function utf8_encode (argString) {
app/assets/javascripts/lib/utils/utf8_encode.js:  // *     example 1: utf8_encode('Kevin van Zonneveld');
app/assets/javascripts/lib/utils/md5.js:function md5 (str) {
app/assets/javascripts/lib/utils/md5.js:  // -    depends on: utf8_encode
app/assets/javascripts/lib/utils/md5.js:  // *     example 1: md5('Kevin van Zonneveld');
app/assets/javascripts/lib/utils/md5.js:  str = this.utf8_encode(str);
```


See merge request !5613

Instrument the Repository class

## What does this MR do?

This MR instruments the Repository class.

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

No.

## Why was this MR needed?

This class wasn't instrumented.

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [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)

See merge request !5621

Since this isn't an ActiveRecord::Base descendant it wasn't
instrumented.

Add help document describing intended wiki linking behavior

Related to #16568
Closes #18019

- This documents the _intended_ behaviour of linking to wiki pages/files.

## TODO

- [x] Respond to @rymai's comments
    - [x] Use `succeed`
    - [x] Shouldn't this be <wiki_root>/miscellaneous.md here?
    - [x] what happens for file links that starts with a `/`?

See merge request !4372

Always compare with FETCH_HEAD in downtime_check

See merge request !5619

fix TODO comment

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/20376

After some testing, I've found out this wasn't needed and attachments seemed to work fine for import/export between instances (omnibus & source).

See merge request !5617

Only use RequestStore in ProjectTeam#max_member_access_for_users if it is active

See merge request !5604

This ensures this CI step works properly even when doing a shallow
clone.

Add support for relative links starting with ./ or / to RelativeLinkFilter

## What does this MR do?

- Allow explicit relative links in Markdown (starting with `./`).
- Allow absolute links (relative to the branch's root directory) in Markdown (starting with `/`).

## Why was this MR needed?

Those link types were not supported before.

## What are the relevant issue numbers?

fixes #19028

See merge request !5586

This reverts commit 1bba46d6.

Update installation guide for 8.11

[ci skip]

See merge request !5609

[ci skip]

Catch what warden might throw when profiling requests to re-throw it

## What does this MR do?
It fixes the error thrown when profiling a request unauthorized.

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

## Why was this MR needed?
It's a bug! :)

## What are the relevant issue numbers?
#20488

## Screenshots (if relevant)
N/A

## 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 !5596

Closes #20488

Fix RequestProfiler::Middleware error when code is reloaded in development

## What does this MR do?
It explicitly requires `Gitlab::RequestProfiler::Middleware` before inserting it in the stack instead of autoloading it.

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

## Why was this MR needed?
It fixes #20452

## What are the relevant issue numbers?
#20452 

## Screenshots (if relevant)
N/A

## 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 !5593

webhooks: include old revision in MR update events

## What does this MR do?

Includes the old revision for an MR in webhooks.

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

The docs do not give an example `update` hook; should I add one?

## Why was this MR needed?

In order to keep web hook listeners stateless, it helps to include the previous revision of the MR in the hook so that it does not need to remember the last revision (which may also be wrong in case of missed or out-of-order events due to previous errors).

## What are the relevant issue numbers?

N/A

## Screenshots (if relevant)

N/A

## 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)
- [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 !5535

Use fewer queries for CI charts

## What does this MR do?
It reduces number of queries sent for aggregating counts for CI graphs.

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

## Why was this MR needed?
For this project (gitlab-ce), loading `/graphs/master/ci` is so slow it times out eventually. I did a quick benchmarking on production and found that it can take 72.5 seconds to only load the controller action variables (there are queries done from the view, didn't look into those). This MR reduces the time to about 2.5 seconds.

Extra improvement could be done by introducing an index on `gl_project_id` and `created_at` for `ci_builds` table, but I can't confirm that right  now.

## What are the relevant issue numbers?
#20262 

## Screenshots (if relevant)
N/A

## 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~~
  - [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 !5502

Line tooltip up with icon

## What does this MR do?
Lines up tooltip with CI icon

## What are the relevant issue numbers?
Closes #20294 

## Screenshots (if relevant)
![Screen_Shot_2016-07-26_at_2.25.22_PM](/uploads/45b6328bc5676b6645d1b7a58803cec4/Screen_Shot_2016-07-26_at_2.25.22_PM.png)


See merge request !5508

API methods should be documented using Grape's DSL

## What does this MR do?

Document that we should now document API methods using Grape DSL too.

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2397#note_13491048 for the discussion.

See merge request !5594

Fix search results for notes without commits

part of #20063   

![deleted_commit](/uploads/5d99b9aedaf4f728425d95f7a9734d98/deleted_commit.png)

See merge request !5571

Pipelines/Builds updates

## What does this MR do?
Adds branch/tag icons in admin view; increase min-width of builds tables

## What are the relevant issue numbers?
#20139

## Screenshots (if relevant)
Branch icons:    
![Screen_Shot_2016-07-27_at_1.29.57_PM](/uploads/2fceddfed5ed1a28d9b7d5e2427cba93/Screen_Shot_2016-07-27_at_1.29.57_PM.png)

Reduce `icon-container` width, before:
![Screen_Shot_2016-07-27_at_5.29.32_PM](/uploads/e3fe38edc262f6460572e20102ef9b6d/Screen_Shot_2016-07-27_at_5.29.32_PM.png)
Reduce `icon-container` width, after:
![Screen_Shot_2016-07-27_at_5.29.03_PM](/uploads/58b82e2c1491672c95dfe35911891891/Screen_Shot_2016-07-27_at_5.29.03_PM.png)

See merge request !5527

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2397#note_13491048