remove excess imports

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

tests/unit/test_session.py

@@ -2,11 +2,6 @@
 from unittest.mock import patch, Mock
 import gc
 
-from databricks.sql.thrift_api.TCLIService.ttypes import (
-    TOpenSessionResp,
-    TSessionHandle,
-    THandleIdentifier,
-)
 from databricks.sql.backend.types import SessionId, BackendType
 
 import databricks.sql