Add migration to sync ScanResultPolicyRead

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/128378



Merged-by: Mayra Cabrera <mcabrera@gitlab.com>
Approved-by: Rajendra Kadam <rkadam@gitlab.com>
Approved-by: Mohamed Hamda <mhamda@gitlab.com>
Approved-by: Dominic Bauer <dbauer@gitlab.com>
Approved-by: Mayra Cabrera <mcabrera@gitlab.com>
Reviewed-by: Mayra Cabrera <mcabrera@gitlab.com>
Reviewed-by: Rajendra Kadam <rkadam@gitlab.com>
Reviewed-by: Mohamed Hamda <mhamda@gitlab.com>
Reviewed-by: Martin Čavoj <mcavoj@gitlab.com>
Co-authored-by: Martin Čavoj <mcavoj@gitlab.com>
Co-authored-by: Andy Soiron <asoiron@gitlab.com>