Quick actions for adding/removing epic parent relations
What does this MR do?
/parent_epic <epic reference> and
/remove_parent_epic <epic reference> quick actions to add or remove a parent epic to another epic.
Follow-up issue for documentation: https://gitlab.com/gitlab-org/gitlab-ee/issues/12488
Does this MR meet the acceptance criteria?
- Changelog entry
- Documentation created/updated or follow-up review issue created
- Code review guidelines
- Merge request performance guidelines
- Style guides
- Separation of EE specific content
Performance and testing
- Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
Tested in all supported browsers
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:
Label as security and @ mention
The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
Security reports checked/validated by a reviewer from the AppSec team
Closes #10556 (closed)