Merge branch 'mc_rocha_add_pipeline_policy_jobs_count_metric' into 'master'

Add job count metric for pipeline execution policy

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/159957



Merged-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Approved-by: Andy Schoenen <asoiron@gitlab.com>
Approved-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Approved-by: drew stachon <730684-drew@users.noreply.gitlab.com>
Reviewed-by: Andy Schoenen <asoiron@gitlab.com>
Co-authored-by: mc_rocha <mrocha@gitlab.com>