Prepare 16.1.5 release for omnibus-gitlab-jh

Release issue: https://jihulab.com/gitlab-cn/release/tasks/-/issues/95

Summary

This MR prepares 16-1-stable-jh for 16.1.5.

Automated cherry-picking

Merge requests labeled ~"Pick into 16.1" should be automatically picked into this MR.

Manual intervention

If merge requests cannot be picked automatically they have to be created manually targeting 16-1-stable-jh-patch-5.

---

See also Patch Releases documentation.