Add read-only banner to all pages
What does this MR do?
When the database is in a read-only state, display a banner on each page informing the user they cannot write to that GitLab instance.
Screenshots (if relevant)
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
- Internationalization required/considered
End-to-end tests pass (
package-qamanual pipeline job)
What are the relevant issue numbers?