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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| .. | ||
| abstract_link_filter_spec.rb | ||
| autolink_filter_spec.rb | ||
| blockquote_fence_filter_spec.rb | ||
| commit_range_reference_filter_spec.rb | ||
| commit_reference_filter_spec.rb | ||
| emoji_filter_spec.rb | ||
| external_issue_reference_filter_spec.rb | ||
| external_link_filter_spec.rb | ||
| gollum_tags_filter_spec.rb | ||
| html_entity_filter_spec.rb | ||
| image_link_filter_spec.rb | ||
| inline_diff_filter_spec.rb | ||
| issue_reference_filter_spec.rb | ||
| label_reference_filter_spec.rb | ||
| merge_request_reference_filter_spec.rb | ||
| milestone_reference_filter_spec.rb | ||
| redactor_filter_spec.rb | ||
| reference_filter_spec.rb | ||
| relative_link_filter_spec.rb | ||
| sanitization_filter_spec.rb | ||
| snippet_reference_filter_spec.rb | ||
| syntax_highlight_filter_spec.rb | ||
| table_of_contents_filter_spec.rb | ||
| upload_link_filter_spec.rb | ||
| user_reference_filter_spec.rb | ||
| video_link_filter_spec.rb | ||
| wiki_link_filter_spec.rb | ||
| yaml_front_matter_filter_spec.rb | ||