* master: (175 commits)
Fix typo
Always use `fixture_file_upload` helper to upload files in tests.
Add CHANGELOG
Fix extra spacing in all rgba methods in status file
Improve spacing and fixes manual status color
Add `ci-manual` status CSS with darkest gray color
Move admin application spinach test to rspec
Move admin deploy keys spinach test to rspec
Fix CI/CD statuses actions' CSS on pipeline graphs
Fix rubocop failures
Store mattermost_url in settings
Improve Mattermost Session specs
Ensure the session is destroyed
Improve session tests
Setup mattermost session
Fix link from doc/development/performance.md to 'Performance Monitoring'
Fix query in Projects::ProjectMembersController to fetch members
Improve test for sort dropdown on members page
Fix sort dropdown alignment
Undo changes on members search button stylesheet
...