* upstream/master: (226 commits)
  Polish sidebar toggle
  Add changelog entry
  Fix optional args for POST :id/variables
  Update CHANGELOG.md for 9.3.1
  Bump bootsnap to 1.1.1
  Add explicit message when no runners on admin
  Fix endpoint not being update correctly
  Remove unused Gitlab::Git::Commit#to_diff argument
  Drop GFM support for the title of Milestone/MergeRequest in template
  Handle Promise rejections in mr_widget_pipeline_spec.js
  Handle missing pipeline in merge request widget
  Store merge request ref_fetched status in the database
  Tag a spec as :nested_groups since it fails on MySQL
  Bump premailer-rails gem to 1.9.7 and its dependencies to prevent network retrieval of assets
  Truncate long job names in environment view; wrap author to next line
  Replaces 'dashboard/merge_requests' spinach with rspec
  Update GITLAB_SHELL_VERSION to 5.0.6
  Fix click not being able to find the current element to use trigger('click') instead
  make accepting mrs more prominent
  Remove last references to job for pipeline charts
  ...