refactor: 💡 remove route-action usage in accounts (#2134)

* refactor: 💡 remove route-action usage in accounts

✅ Closes: https://hashicorp.atlassian.net/browse/ICU-12616

ui/admin/app/components/auth-methods/auth-method/accounts/account/actions/index.hbs

@@ -12,7 +12,7 @@
     <dropdown.button
       @style='danger'
       @disabled={{@model.canSave}}
-      {{on 'click' (route-action 'deleteAccount' @model)}}
+      {{on 'click' (fn @delete @model)}}
     >
       {{t 'resources.account.actions.delete'}}
     </dropdown.button>