<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=1344) </details> <!--IssueSummary end--> We need to delete these items from the mirror given it doesn't makes sense to have them after they have been deleted on the upstream. We need to be careful about not deleting branches that were created on the mirror. /cc @DouweM