Merge branch 'hm-parameterise-policy-branch-names' into 'master'

Parameterise policy branch names for test coverage

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141754



Merged-by: Andy Soiron <asoiron@gitlab.com>
Approved-by: Lee Tickett <ltickett@gitlab.com>
Approved-by: Andy Soiron <asoiron@gitlab.com>
Reviewed-by: Lee Tickett <ltickett@gitlab.com>
Co-authored-by: Lee Tickett <ltickett@gitlab.com>
Co-authored-by: hmuralidhar <hmuralidhar@gitlab.com>