Various fixes and improvements (#12878)

* Fix unused role routes being generated

* Remove unused JavaScript code

* Refactor filters code to be DRYer

* Fix `.count == 0` comparisons to `.empty?` in views

* Fix filters in views

app/controllers/admin/reports_controller.rb

@@ -52,12 +52,7 @@ module Admin
     end
 
     def filter_params
-      params.permit(
-        :account_id,
-        :resolved,
-        :target_account_id,
-        :by_target_domain
-      )
+      params.slice(*ReportFilter::KEYS).permit(*ReportFilter::KEYS)
     end
 
     def set_report