add policies for getInvalidUsers route

app/Http/Controllers/UserController.php

@@ -218,6 +218,9 @@ class UserController extends Controller
     }
 
     public function getInvalidUsers(Request $request): JsonResponse {
+        if(Gate::denies('getInvalidUsers', $request->user())){
+            return response()->json(["message" => "Can't add role to this user"], 403);
+        }
 
         try {