Merge branch...

Merge branch '416903-projects-can-link-and-inherit-the-same-security-policy-project-feature-flag-enabled-default' into 'master' 

Enable `security_policies_unassign_redundant_policy_projects` FF

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148741



Merged-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Martin Čavoj <mcavoj@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Reviewed-by: Martin Čavoj <mcavoj@gitlab.com>
Co-authored-by: Dominic Bauer <dbauer@gitlab.com>