Prepare 11.10.4 release

Release issue: gitlab-org/release/tasks#774 (closed)

Summary

This MR prepares 11-10-stable for 11.10.4.

Automated cherry-picking

Merge requests labeled ~"Pick into 11.10" should be automatically picked into both the CE and EE prepration MRs using the following ChatOps command:

# In Slack
/chatops run release merge 11.10.4