Revert to use Mounter method to check existence

## What does this MR do?

Revert a change on gitlab-ce that we never get into gitlab-ee due to spec failures and a lack of a proper solution. So we want to keep both repos in the same codebase about this.

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

## Why was this MR needed?

## Screenshots (if relevant)

## 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
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] 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)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #22768

See merge request !6590

This MR fixes a bug that unnecessary escapes reserved HTML characters for Milestone's title.  See #22452. 

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

- Unescaping of sanitized milestone title before it is being stored in the database. See `Milestone#title` and a private method called `Milestone#sanitize_title`
- Sufficient tests were added (Model and API tests were modified/added).

## Why was this MR needed?

To allow reserved HTML characters in a milestone's title, such as "PHP migration 5.6 -> 7.0". The text appears in 'milestones' and in a dropdown during issue creation, issue list, and in another dropdown for issue filter. 

Closes #22452

See merge request !6533

Closes todos for a merge request when the MR is accepted via the API by the MR assignee.

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

Please review refresh service test changes to see if they are correct - I think in those cases, the todos should actually be cleared instead of left pending.

## Why was this MR needed?

To make the API behavior consistent with the UI behavior (accepting your own MRs closes the todo item and prevents them from piling up).

Closes #22477

See merge request !6486

New `AccessRequestsFinder`

Part of #21979.

## Does this MR meet the acceptance criteria?

- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] 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 !6268

See: https://gitlab.com/gitlab-org/gitlab-ce/commit/6280fd3777920670ee42111fddf29576cbf85988#note_14766241

We wanted to avoid accesses to the file system, because it seems reasonable that if the mounter column has some content it’s because there are an associate file. This is an speed boost when you access to a bunch of build instances to show their information.

The problem is that solution doesn’t work if you uses that method to detect the thing and you’re changing the uploaded file on instances that had that column empty. Until you don’t persist the instance the database column will be empty so we can have false negatives

Merge remote-tracking branch 'origin/22452-milestone-title-unnecessary-escaping-fix' into 22452-milestone-title-unnecessary-escaping-fix

Updating test value for milestone title

Adding API test for title with reserved HTML characters.

Updating changelog

Adding the MR number for fixing bug #22452.

removing duplicate line

Updating MR number.

Fix race condition on LFS Token

## What does this MR do?

 Fixes a race condition that can be triggered if the token expires right after we retrieve it, but before we can set the new expiry time. 

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6551#note_16190569

Thanks for catching this so quickly @jacobvosmaer-gitlab 

cc @DouweM

See merge request !6592

Right-align dropdown menus to prevent horizontal page overflow

Added `dropdown-menu-align-right` class to a few dropdown menus in the Projects -> Explore -> All page to prevent overflow.

Closes #22632

See merge request !6600

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

Fix broken repo errors in the UI

This should prevent repo errors (or 404s) in the UI, together with https://gitlab.com/gitlab-org/gitlab_git/merge_requests/124

The `exists?` cache is now expired if the repo gets broken. 

Related MR: https://gitlab.com/gitlab-org/gitlab_git/merge_requests/124

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/20501

See merge request !6491

Fix race condition that can be triggered if the token expires right after we retrieve it, but before we can set the new expiry time.

Fix grammar and typos in Runners pages

_Originally opened at !1791 by @axil._

- - -

## 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
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] 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)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !6547

Fixes long commit messages overflow viewport in file tree

## What does this MR do?
Fixes long commit messages breaking the table.
It adds back a max-width in `pixels` instead of `%`.

## Are there points in the code the reviewer needs to double check?
No.
## Why was this MR needed?
To fix the overflow of the commit message

## Screenshots (if relevant)
![max_width](/uploads/73af2ffbab29bf6e9bbd9287e9e142a0/max_width.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
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [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)

## What are the relevant issue numbers?

Fixes #22544

See merge request !6573

Fix double CHANGELOG header for 8.13

[ci skip]

See merge request !6593

Expose project share expiration_date field on API

closes #22382

See merge request !6484

Remove instances of HTML5 input type="color" due to inconsistent browser support

## What does this MR do?

`<input type="color" />` renders differently across browsers.  Reverting to `type="text"` where necessary.

## Screenshots (if relevant)

Safari (top) vs Chrome (bottom)
![Screen_Shot_2016-09-28_at_11.53.02_AM](/uploads/f967ed988320cbd2e4357cdfcfe7a813/Screen_Shot_2016-09-28_at_11.53.02_AM.png)

See merge request !6576

Upgrade Devise from 4.1.1 to 4.2.0.

This fixes an issue with Rails 5 and brings us up-to-date with the latest Devise release. It also deprecates `Devise::TestHelpers` in favor of `Devise::Test::ControllerHelpers`.

Changelog: https://github.com/plataformatec/devise/blob/v4.2.0/CHANGELOG.md#420---2016-07-01

Working toward #14286, as always.

See merge request !6461

Use a ConnectionPool for Rails.cache on Sidekiq servers

## What does this MR do?

On Sidekiq server we'll use a connection pool to connect to the redis store used for Rails cache. But now we're sure we're not modifying the configuration used on the lazy create Redis connection inside the connection pools. I've create a PR on [redis-activesupport](https://github.com/pacoguzman/redis-activesupport) too. @jacobvosmaer-gitlab make this easier updating the Gitlab::Redis class !6472

Closes #22364

See merge request !6468

Resolve "Resolved comments permanently hidden in Side-by-Side diff view"

## What does this MR do? / Why was this MR needed?

Ensures resolved discussions are made visible when clicking "toggle comments" on Side-by-Side view diff pages.

## 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)

## What are the relevant issue numbers?

Closes #21535

See merge request !6575