Merge branch 'update-epic-migration-sync-testing' into 'master'

Update epic migration sync specs

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/159146



Merged-by: Andrejs Cunskis <acunskis@gitlab.com>
Approved-by: Andrejs Cunskis <acunskis@gitlab.com>
Reviewed-by: Andrejs Cunskis <acunskis@gitlab.com>
Co-authored-by: Desiree Chevalier <dchevalier@gitlab.com>