Merge remote-tracking branch 'upstream/master' into fix-forbidden-for-build-api-for-deleted-project

* upstream/master: (333 commits)
  Fix typo
  Always use `fixture_file_upload` helper to upload files in tests.
  Add CHANGELOG
  Move admin application spinach test to rspec
  Move admin deploy keys spinach test to rspec
  Fix rubocop failures
  Store mattermost_url in settings
  Improve Mattermost Session specs
  Ensure the session is destroyed
  Improve session tests
  Setup mattermost session
  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
  Use factories to create project/group membership on specs
  Remove unused id from shared members sort dropdown
  Fix sort functionality on project/group members to return invited users
  Refactor MembersHelper#filter_group_project_member_path
  Remove unnecessary curly braces from sort dropdown partial
  ...