Handle force_remove_source_branch when creating merge request

Closes #51220

See merge request gitlab-org/gitlab-ce!23281

deprecate UX Guide and redirect to design.gitlab

Closes #54089

See merge request gitlab-org/gitlab-ce!22796

Creating a merge request with
`merge_request[force_remove_source_branch]` parameter would result in an
Error 500 since this attribute was passed directly to the merge request.
Fix this by properly parsing this attribute into `merge_params`.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51220

This reverts merge request !23234

Documentation: Fix typo in Merge request description

See merge request gitlab-org/gitlab-ce!23266

Make existing SSH create / remove test into a Smoke test

Closes #52699

See merge request gitlab-org/gitlab-ce!23252

Use cached size when passing artifacts to Runner

See merge request gitlab-org/gitlab-ce!23228

Precisions about the times specified in gitlab.rb for Rack Attack

See merge request gitlab-org/gitlab-ce!23246

Fixes stuck tooltip on stop env button

Closes #53571 and #54282

See merge request gitlab-org/gitlab-ce!23244

Work around Ruby 2.5.3 crash when a CI job is selected

See merge request gitlab-org/gitlab-ce!23256

Docs: specify regexp language used for `only`/`except` mechanism in `.gitlab-ci.yaml`

See merge request gitlab-org/gitlab-ce!23235

Port of EE-translations to CE

See merge request gitlab-org/gitlab-ce!23247

Adds missing status in deployment widget

See merge request gitlab-org/gitlab-ce!23239

Documented Response of /wikis/home should be a wiki object and not an array

See merge request gitlab-org/gitlab-ce!23263

Resolve "Access project from descendent groups when selecting project to create new issue"

Closes #47096 and #52453

See merge request gitlab-org/gitlab-ce!22612

[ci skip]

* master: (24 commits)
  Adds a PHILOSOPHY.md
  Externalize strings from `/app/views/abuse_reports`
  Fix Issuable container element selector for shortcuts handling
  Enable Rubocop on lib/gitlab
  Add user docs for Pages access control
  Added information about syntax highlighting in Web IDE. Fixes gitlab-org/gitlab-ce#53571
  Align issue status label and confidential icon
  Externalize strings from `/app/views/repository_check_mailer`
  Remove instances of `@extend .monospace`
  Resolve "The reply shortcut can add any text of the page to the "comment" text area"
  Upgrade escape_utils to 1.2.1
  Add dedicated runner tags to assets job
  Upgrade gitlab eslint config to latest
  Fix broken karma specs
  Disable conflicting eslint rules
  Prettify all the things
  Upgrade prettier to 1.15.2
  Added a test for open merge request files
  Update CHANGELOG.md for 11.4.7
  Open first 10 merge request files in IDE
  ...

Enable Rubocop on lib/gitlab

See merge request gitlab-org/gitlab-ce!23259

Externalize strings from `/app/views/abuse_reports`

See merge request gitlab-org/gitlab-ce!23203

Add dedicated runner tags to assets job

See merge request gitlab-org/gitlab-ce!23242

Adds a PHILOSOPHY.md

See merge request gitlab-org/gitlab-ce!23200

CE Backport: Fix Issuable container element selector for shortcuts handling

See merge request gitlab-org/gitlab-ce!23260

Ruby 2.5.3 in combination with Rails 5 appears to crash in development
when a CI job is selected for a runner. For some reason, the return
inside the block seems to seg fault. Let's get rid of this since
this isn't a good coding practice in any case.

Relates to https://gitlab.com/gitlab-org/gitlab-ce/issues/54281

Also see https://bugs.ruby-lang.org/issues/15325.

Docs specify labels in project and group list pages

See merge request gitlab-org/gitlab-ce!22886

Update README.md

See merge request gitlab-org/gitlab-ce!23192

Fix typo in Getting Started page

See merge request gitlab-org/gitlab-ce!23219

This should wrap up frozen string
enablement for gitlab-ce.

xref gitlab-org/gitlab-ce#47424.

Upgrade prettier to v1.15.2

See merge request gitlab-org/gitlab-ce!22893

Add user docs for Pages access control

Closes #54143

See merge request gitlab-org/gitlab-ce!23145

Merge branch '53571-Add-the-fact-that-Web-IDE-does-syntax-highlighting-for-all-languages-supported-by-Monaco' into 'master'

Added information about syntax highlighting in Web IDE. Fixes gitlab-org/gitlab-ce#53571

Closes #53571

See merge request gitlab-org/gitlab-ce!23117