Merge remote-tracking branch 'upstream/master' into all-skipped-equals-success

* upstream/master: (55 commits)
  Restrict failed login attempts for users with 2FA
  Update RuboCop to 0.43.0 and update configuration
  Use SELECT 1, instead SELECT COUNT(*) to ask for notes existency
  Simplify Mentionable concern instance methods
  Fix issues importing services via Import/Export
  deployment refs in own folder, new method for creating refs
  Update method name
  Save a fetchable ref per deployement
  GrapeDSL for Namespace endpoint
  Remove SCSS rules for short hex chars.
  Fix bug when trying to cache closed issues from external issue trackers
  Upgrade acts-as-taggable-on from 3.5.0 to 4.0.0.
  Remove useless code now that Member#add_user handles it
  Combine requestFileSuccess arguments into `opts`
  Append issue template to existing description
  Invert method's naming
  Fix a few things after the initial improvment to Members::DestroyService
  Improve Members::DestroyService
  Add Container Registry on/off status to admin area
  Enable Lint/StringConversionInInterpolation cop and autocorrect offenses
  ...