Merge branch '210537-move-alerts-controller-to-core' into 'master'

Move AlertsController to Core

Closes #210537

See merge request gitlab-org/gitlab!28091

ee/spec/controllers/projects/prometheus/alerts_controller_spec.rb → spec/controllers/projects/prometheus/alerts_controller_spec.rb

@@ -9,7 +9,6 @@ describe Projects::Prometheus::AlertsController do
   let_it_be(:metric) { create(:prometheus_metric, project: project) }
 
   before do
-    stub_licensed_features(prometheus_alerts: true)
     project.add_maintainer(user)
     sign_in(user)
   end