[skip ci] Remove unused code (#11312)

Signed-off-by: NBinbin Lv <binbin.lv@zilliz.com>

tests/python_client/testcases/test_flush.py

@@ -68,14 +68,10 @@ class TestFlushBase:
         connect.flush([collection])
         results = connect.insert(collection, default_entities)
         assert len(results.primary_keys) == default_nb
-        # status = connect.delete_entity_by_id(collection, ids)
-        # assert status.OK()
         connect.flush([collection])
         res = connect.get_collection_stats(collection)
         assert res["row_count"] == default_nb
         connect.flush([collection])
-        # with pytest.raises(Exception) as e:
-        #     connect.flush([collection])
 
     @pytest.mark.tags(CaseLabel.L2)
     def test_add_partition_flush(self, connect, id_collection):