* master:
  Add documentation: Overview of Frontend Testing
  Resolve "Add `/confidential` quick action for issues"
  i18n: externalize strings from 'app/views/award_emoji'
  Fix broken tests due to bad conflict resolution
  Updates eslint rules
  Documentation does not need an exception to be picked
  Fix conflicts caused by vue_shared/components/user_avatar/user_avatar_image.vue
  [Rails5] Fix `storage_counter` helper
  Adjust SQL and transaction Prometheus buckets
  Updates eslint vue plugin version