chore: Fix bucket cleanup in system tests

PiperOrigin-RevId: 867666396

Author: sararob

tests/system/aiplatform/e2e_base.py

@@ -116,7 +116,7 @@ def delete_staging_bucket(self, shared_state: Dict[str, Any]):
 
         # Get the staging bucket used for testing and wipe it
         bucket = shared_state["bucket"]
-        bucket.delete_blobs(bucket.list_blobs())
+        bucket.delete_blobs(list(bucket.list_blobs()))
         bucket.delete()
 
     @pytest.fixture(scope="class")