Refactor fast-forward merge requests docs

See merge request !1137

[ci skip]

Port of ui-updates to EE

See merge request !1113

Fix filtered search so that labels selected from discussion notes display correctly

See merge request !1122

Fix GitLab Pages not refreshing upon new content

Closes gitlab-com/infrastructure#1058

See merge request !1134

Friday CE upstream

Closes gitlab-ce#27044

See merge request !1136

Change "Builds" word to "Pipelines" in Mirror settings page

See merge request !1131

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

Fix Error 500 when repositories contain annotated tags pointing to blobs

Closes #27228

See merge request !8800

Use hashrocket for dasherized attribute

Closes #1623

See merge request !1135

Make notification_service spec DRYer by making some tests reusable

See merge request !7794

Don't override Ci::Build#user when presenting a build

Closes #26943

See merge request !8668

Due to autoloading and Ruby scoping, the .update file was never being
updated due to this error:

```
NoMethodError: undefined method `pages' for Projects::Settings:Module
        from /opt/gitlab/embedded/service/gitlab-rails/app/services/projects/update_pages_configuration_service.rb:50:in `pages_update_file'
        from /opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/metrics/instrumentation.rb:157:in `pages_update_file'
        from (irb):6
        from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands/console.rb:110:in `start'
        from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands/console.rb:9:in `start'
        from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands/commands_tasks.rb:68:in `console'
        from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
        from /opt/gitlab/embedded/lib/ruby/gems/2.3.0/gems/railties-4.2.7.1/lib/rails/commands.rb:17:in `<top (required)>'
        from bin/rails:9:in `require'
```

This error was caught and discarded quietly. This fix exercises this code and fixes the scope problem.

Closes gitlab-com/infrastructure#1058

Document "No gems fetched from git repositories" policy [ci skip]

See merge request !8818

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

Use `:empty_project` where possible in model specs

See merge request !8832

Use `:empty_project` where possible in request specs

See merge request !8833

Added PHP & NPM samples for Gitlab CI

See merge request !6199

fix depr. warning; use `Devise::Test::ControllerHelpers`

Closes #26942

See merge request !8812

Remove unused js response from refs controller

Closes #27211

See merge request !8828

Add caching of droplab ajax requests

Closes #26844

See merge request !8725

Revert filter-assigned-to-me

Closes #27176

See merge request !8785

fixed small mini pipeline graph line glitch

Closes #27277

See merge request !8804

Fix /explore sorting (trending)

Closes #27044

See merge request !8792

Prevent form to be submitted twice

Closes #27220

See merge request !8825

Fix filtered search so that labels selected from discussion notes display correctly

Closes #27124

See merge request !8756

Change repository storage paths location for clarity

See merge request !1130

Merge branch '27254-clicking-line-anchor-multiple-times-causes-scroll-position-to-over-correct' into 'master'

Resolve "Clicking line anchor multiple times causes scroll position to over-correct"

Closes #27254

See merge request !8791

Change repository storage paths location for clarity

See merge request !8757