Initial custom emoji implementation
- Add custom emoji to markdown rendering and autocomplete.
- You can add new custom emojis via group or profile settings
Does this MR meet the acceptance criteria?
- Changelog entry added, if necessary
- Documentation created/updated
- API support added
- Tests added for this feature/bug
- Has been reviewed by UX
- Has been reviewed by Frontend
- Has been reviewed by Backend
- Has been reviewed by Database
- Conform by the merge request performance guides
- Conform by the style guides
- Squashed related commits together
- Add Geo support, https://gitlab.com/gitlab-org/gitlab-ee/issues/3903
What are the relevant issue numbers?
Closes #13931 (closed)