Merge branch 'master' into 27574-pipelines-empty-state

* master: (23 commits)
  Resolve "Extract logic of who should receive notification into separate classes"
  Remove UJS actions from pipelines tables
  Added Gitlab::Database.config
  Fix time-sensitive helper spec
  Updates realtime documentation for the Frontend
  Add ability to disable Merge Request URL on push
  Added labels to the issue web hook
  documentation blurb in issue template
  Add a new have_html_escaped_body_text that match an HTML-escaped text
  Stop CI notification showing when status is nil
  Refactor award emojis document
  Do not use Ruby Timeout module in GitLab QA
  Make sure alias email would never match:
  Make the test less time sensitive by extending 0.2
  Restore sub-nav for empty project
  Fix Unicode 1.1 emojis
  Use "branch_name" instead "branch" on V3 branch creation API
  Fixed eslint
  Catches errors when generating lists
  Resolve GitLab QA cold boot problems on entry page
  ...