Revert "Disable security scanner alerts"

This reverts commit 389b79c1.

ee/app/controllers/projects/security/dashboard_controller.rb

@@ -9,7 +9,7 @@ module Projects
 
       before_action only: [:index] do
         push_frontend_feature_flag(:hide_dismissed_vulnerabilities)
-        push_frontend_feature_flag(:scanner_alerts, default_enabled: false)
+        push_frontend_feature_flag(:scanner_alerts, default_enabled: true)
       end
     end
   end

ee/changelogs/unreleased/230510-re-enable-security-scanner-alerts.yml

+---
+title: Enable security scanner alerts
+merge_request: 37655
+author:
+type: added