Merge branch '460080-remove-old-migration-class-and-specs' into 'master'

Delete old migration class and its specs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/163026



Merged-by: Michael Becker <11881043-wandering_person@users.noreply.gitlab.com>
Approved-by: Michael Becker <11881043-wandering_person@users.noreply.gitlab.com>
Approved-by: Gregory Havenga <11164960-ghavenga@users.noreply.gitlab.com>
Co-authored-by: Bala Kumar <sbalakumar@gitlab.com>