Prepare 16.6.5 release for gitlab-jh

Release issue: https://jihulab.com/gitlab-cn/release/tasks/-/issues/127

Summary

This MR prepares 16-6-stable-jh for 16.6.5.

Automated cherry-picking

Merge requests labeled Pick into 16.6 should be automatically picked into this MR.

Manual intervention

If merge requests cannot be picked automatically they have to be created manually targeting 16-6-stable-jh-patch-5.

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See also Patch Releases documentation.