Prepare 9.4 RC2-EE
What
Adds the current commit from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2411 to 9-4-stable-ee
Why
Fix migration which prevented RC1 deploy to staging. Picked here early to run tests on staging branch
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Adds the current commit from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2411 to 9-4-stable-ee
Fix migration which prevented RC1 deploy to staging. Picked here early to run tests on staging branch