Merge branch 'sk/512468-delete-invalid-policies' into 'master'

Delete security_policies when policy.yml becomes invalid

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/181837



Merged-by: Eugie Limpin <elimpin@gitlab.com>
Approved-by: Marcos Rocha <mrocha@gitlab.com>
Approved-by: Eugie Limpin <elimpin@gitlab.com>
Reviewed-by: Eugie Limpin <elimpin@gitlab.com>
Co-authored-by: Sashi Kumar Kumaresan <skumar@gitlab.com>