Merge branch 'enforce-rules-limit-vulnerability-management-policy' into 'master'

Limit vulnerability management policy to 5 rules

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/172874



Merged-by: Alexander Turinske <aturinske@gitlab.com>
Approved-by: Martin Čavoj <mcavoj@gitlab.com>
Approved-by: Ryan Lehmann <rlehmann@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: Lorenz van Herwaarden <lvanherwaarden@gitlab.com>