refactor: 💡 remove route-action usage for roles (#2292)

* refactor: 💡 remove route-action usage for roles

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-12608

ui/admin/app/components/roles/role/actions/index.hbs

@@ -18,7 +18,7 @@
     <dropdown.button
       @style='danger'
       @disabled={{@model.canSave}}
-      {{on 'click' (route-action 'delete' @model)}}
+      {{on 'click' (fn @delete @model)}}
     >
       {{t 'resources.role.actions.delete'}}
     </dropdown.button>