feat: restrict admin role assignment to the privileged roles

templates/admin/user/modal_edit.html.twig

@@ -9,6 +9,9 @@
     <div class="pb-4 text-sm text-gray-500">
         {{ user.email }}
     </div>
+    <div class="pb-4 text-sm text-gray-500">
+        aus BusPro: {{ syncedRoles | map_roles | join(', ') | default('–') }}
+    </div>
     {{ form_start(form) }}
     <div class="grid lg:grid-cols-2 gap-y-4 lg:gap-x-8">
         {{ form_row(form.roles) }}