Merge branch 'issue-discussions-refactor' of gitlab.com:gitlab-org/gitlab-ce into issue-discussions-refactor

* 'issue-discussions-refactor' of gitlab.com:gitlab-org/gitlab-ce:
  Fix merge request json schema (add labels, milestone)

Improves performance by removing emojis from data object

* master: (42 commits)
  alternative route for download archive
  Add missing command to compile GetText files
  Prevent user from changing username with container registry tags
  Rename RPC 'Exists' to 'RepositoryExists'
  Fix the sticky changes bar on commits page
  Fix ee_compat_check when EE branch uses a prefix
  Removed display styles when hiding the fly out navigation
  Explain why we use select all for project_url_constrainer.rb
  Fix pikaday being undefined
  Add a helper to stub storage settings with defaults
  Enable the Layout/SpaceBeforeBlockBraces cop
  update Install from Source instructions
  Translations can be picked without asking for exceptions
  Ask for exceptions in advance
  Don't require stackprof in Gemfile
  Synchronous Korean translation in zanata
  Use full path of user's avatar in webhooks
  Update icon color on hover
  Align all nav items in sidebar
  Fix height of collapsed sidebar items
  ...

alternative route for download archive

See merge request !13439

Fix the sticky changes bar on commits page

See merge request !13343

Removed display styles when hiding the fly out navigation

Closes #36224

See merge request !13431

Add missing command to compile GetText files

See merge request !13437

Rename RPC 'Exists' to 'RepositoryExists'

See merge request !13277

Fix proxy config in Gitlab Pages nginx examples

See merge request !13375

Don't include anything to Kernel only because of tasks

Closes #36003

See merge request !13380

Prevent user from changing username with container registry tags

Closes #35451

See merge request !13356

Enable the Layout/SpaceBeforeBlockBraces cop

See merge request !13413

Update icon color on hover

Closes #35996

See merge request !13393

Fixed merge request changes sticky container not spreading full width

See merge request !13386

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

Closes #36224

Align all nav items in sidebar

Closes #36179

See merge request !13392

Fix height of collapsed sidebar items

See merge request !13385

Explain why we use select all for project_url_constrainer.rb

See merge request !13425