Move UpdateHighestRoleWorker to utilization category

This isn't authentication and authorization because we don't actually
use this for any authorization logic. We only use this for user
statistics in the admin area.

app/workers/all_queues.yml

@@ -2353,7 +2353,7 @@
   :idempotent:
   :tags: []
 - :name: update_highest_role
-  :feature_category: :authentication_and_authorization
+  :feature_category: :utilization
   :has_external_dependencies:
   :urgency: :high
   :resource_boundary: :unknown

app/workers/update_highest_role_worker.rb

@@ -3,7 +3,7 @@
 class UpdateHighestRoleWorker
   include ApplicationWorker
 
-  feature_category :authentication_and_authorization
+  feature_category :utilization
   urgency :high
   weight 2