Merge branch 'cherry-pick-11d5fc78' into '16-6-stable-ee'

Backport Hide obsolete migration warning into 16.6

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138797



Merged-by: Terri Chu <tchu@gitlab.com>
Approved-by: Terri Chu <tchu@gitlab.com>
Co-authored-by: Artur Fedorov <afedorov@gitlab.com>