Draft: Prepare 15.7.1 release

Release issue: gitlab-org/release/tasks#4791 (closed)

Summary

This MR prepares 15-7-stable for 15.7.1.

Automated cherry-picking

Merge requests labeled Pick into 15.7 should be automatically picked into this MR using the following ChatOps command:

# In Slack
/chatops run release merge 15.7.1

Manual intervention

If merge requests cannot be picked automatically they have to be created manually targeting 15-7-stable-patch-1.

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See also Patch Releases documentation.