fix: bind permission-sync task to user id, use per-user RLS cache sentinel on parse failure (#42938)

Co-authored-by: Amin Ghadersohi <amin.ghadersohi@gmail.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

tests/integration_tests/databases/api_tests.py

@@ -4608,8 +4608,9 @@ class TestDatabaseApi(SupersetTestCase):
         assert rv.status_code == 202
         response = json.loads(rv.data.decode("utf-8"))
         assert response == {"message": "Async task created to sync permissions"}
+        admin_user = security_manager.find_user(username=ADMIN_USERNAME)
         mock_task.assert_called_once_with(
-            test_database.id, ADMIN_USERNAME, test_database.database_name
+            test_database.id, admin_user.id, test_database.database_name
         )
 
         # Cleanup