Prepare 18.1.2 release for gitlab-jh

Release issue: https://jihulab.com/gitlab-cn/release/tasks/-/issues/336

Summary

This MR prepares 18-1-stable-jh for 18.1.2.

Automated cherry-picking

Merge requests labeled Pick into 18.1 should be automatically picked into this MR.

Manual intervention

If merge requests cannot be picked automatically they have to be created manually targeting 18-1-stable-jh-patch-2.

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See also Patch Releases documentation.