Mutate the attribute instead of issuing a write operation to the DB

This fixes gitlab-org/gitlab-ee#1520

app/models/concerns/project_features_compatibility.rb

@@ -32,6 +32,6 @@ module ProjectFeaturesCompatibility
     build_project_feature unless project_feature
 
     access_level = Gitlab::Utils.to_boolean(value) ? ProjectFeature::ENABLED : ProjectFeature::DISABLED
-    project_feature.update_attribute(field, access_level)
+    project_feature.send(:write_attribute, field, access_level)
   end
 end

changelogs/unreleased/bug-project-feature-compatibility.yml

+---
+title: Mutate the attribute instead of issuing a write operation to the DB in `ProjectFeaturesCompatibility`
+  concern.
+merge_request: 8552
+author: