Merge branch 'instance-security-dashboard-rollout' into 'master'

Add rollout issue for instance_security_dashboard

See merge request gitlab-org/gitlab!65928

ee/config/feature_flags/development/instance_security_dashboard.yml

 ---
 name: instance_security_dashboard
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/24505
-rollout_issue_url: 
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/259285
 milestone: '12.8'
 type: development
 group: group::threat insights