Merge branch '438794-policies-pipeline-execution-policy-change-schema' into 'master'

Changing pipeline execution policy external CI file schema

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143095



Merged-by: Alexander Turinske <aturinske@gitlab.com>
Approved-by: Martin Čavoj <mcavoj@gitlab.com>
Approved-by: Alexander Turinske <aturinske@gitlab.com>
Reviewed-by: Artur Fedorov <afedorov@gitlab.com>
Reviewed-by: Martin Čavoj <mcavoj@gitlab.com>
Co-authored-by: Artur Fedorov <afedorov@gitlab.com>