Merge branch 'sk/fix-rules-index' into 'master'

Delete approval_policy_rule when rules in policy is removed

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183117



Merged-by: Andy Schoenen <asoiron@gitlab.com>
Approved-by: Alper Akgun <aakgun@gitlab.com>
Approved-by: Marcos Rocha <mrocha@gitlab.com>
Approved-by: Andy Schoenen <asoiron@gitlab.com>
Reviewed-by: Andy Schoenen <asoiron@gitlab.com>
Reviewed-by: Alper Akgun <aakgun@gitlab.com>
Co-authored-by: Sashi Kumar Kumaresan <skumar@gitlab.com>