Add banner to grafana UI to announce it's removal from omnibus
Summary
In GitLab 16.0 we are going to announce the deprecation of the bundled grafana, with plans to remove in 16.3. https://gitlab.com/gitlab-org/distribution/team-tasks/-/issues/1257#note_1361030912
We would like to add a patch to the grafana UI in 16.0 (in addition to our usual deprecation handling), that will further ensure users are aware that the bundled grafana will be going away.
Action Items
- Create a patch that applies a banner to the grafana UI with our message
- Apply patch to the omnibus grafana instance