Merge branch 'eread/separate-out-migrate-to-new-server-topics' into 'master'

Separate out migrate to new server topics

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138135



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Approved-by: Achilleas Pipinellis <axil@gitlab.com>
Approved-by: James Fargher <jfargher@gitlab.com>
Reviewed-by: Achilleas Pipinellis <axil@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>