Prepare 9.3 EE RC4

Summary

This MR prepares 9-3-stable-ee branch to tag %9.3 RC4 via 9-3-stable-ee-rc4 branch.

MRs to Pick for RC4

Use following filter to find eligible MRs;

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests?label_name%5B%5D=Pick+into+Stable&milestone_title=9.3&scope=all&sort=updated_asc&state=merged

Steps

• Cherry-pick MR into 9-3-stable-ee-rc4 and push it to GitLab.com & dev.gitlab.org
• If there were conflicts, create a separate branch off of 9-3-stable-ee-rc4 and create MR, notify authors to resolve conflicts and once MR is green, merge it.
• Once this MR is ready along with https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12260, create CE to EE (9-3-stable-rc4 => 9-3-stable-ee-rc4) merge request.
• Merge CE to EE MR into 9-3-stable-ee-rc4, and then once it is green, merge this MR.