Remove unused import of asyncio in test_models_and_statemanager_new.py to streamline the test file.

Author: NiveditJain

python-sdk/tests/test_models_and_statemanager_new.py

@@ -1,4 +1,3 @@
-import asyncio
 import pytest
 from unittest.mock import AsyncMock, MagicMock, patch