Merge branch 'enable_store_sast_report_by_default' into 'master'

Enable store security reports by default

See merge request gitlab-org/gitlab-ee!8071

ee/app/models/ee/namespace.rb

@@ -216,7 +216,7 @@ module EE
     end
 
     def store_security_reports_available?
-      ::Feature.enabled?(:store_security_reports, self) && (
+      ::Feature.enabled?(:store_security_reports, self, default_enabled: true) && (
         feature_available?(:sast) ||
         feature_available?(:dependency_scanning) ||
         feature_available?(:sast_container) ||