25ff16459c
Add group level labels
## What does this MR do?
Add group level labels.
## Are there points in the code the reviewer needs to double check?
* `LabelsFinder`
* `Gitlab::Gfm::ReferenceRewriter`
* `Banzai::Filter::LabelReferenceFilter`
## Why was this MR needed?
We'll be adding more feature that allow you to do cross-project management of issues.
## Screenshots (if relevant)
* Group Labels
* Project Labels
* Expanded references for group labels when moving issue to another project
## Does this MR meet the acceptance criteria?
- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
- [x] Added for this feature/bug
- [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)
## What are the relevant issue numbers?
#19997
See merge request !6425
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| .. | ||
| auth | ||
| boards | ||
| ci | ||
| files | ||
| groups | ||
| issuable | ||
| issues | ||
| labels | ||
| members | ||
| merge_requests | ||
| milestones | ||
| notes | ||
| projects | ||
| protected_branches | ||
| search | ||
| slash_commands | ||
| compare_service_spec.rb | ||
| create_deployment_service_spec.rb | ||
| create_release_service_spec.rb | ||
| create_snippet_service_spec.rb | ||
| create_tag_service_spec.rb | ||
| delete_tag_service_spec.rb | ||
| delete_user_service_spec.rb | ||
| destroy_group_service_spec.rb | ||
| event_create_service_spec.rb | ||
| git_hooks_service_spec.rb | ||
| git_push_service_spec.rb | ||
| git_tag_push_service_spec.rb | ||
| import_export_clean_up_service_spec.rb | ||
| notification_service_spec.rb | ||
| repair_ldap_blocked_user_service_spec.rb | ||
| repository_archive_clean_up_service_spec.rb | ||
| search_service_spec.rb | ||
| system_hooks_service_spec.rb | ||
| system_note_service_spec.rb | ||
| test_hook_service_spec.rb | ||
| todo_service_spec.rb | ||
| update_release_service_spec.rb | ||
| update_snippet_service_spec.rb | ||