chore: ignore tx warnings in pdml test (#653)

Author: olavloite

test/mockserver_tests/test_basics.py

@@ -218,7 +218,11 @@ def test_partitioned_dml(self):
         add_update_count(sql, 100, AutocommitDmlMode.PARTITIONED_NON_ATOMIC)
         engine = create_engine(
             "spanner:///projects/p/instances/i/databases/d",
-            connect_args={"client": self.client, "pool": PingingPool(size=10)},
+            connect_args={
+                "client": self.client,
+                "pool": PingingPool(size=10),
+                "ignore_transaction_warnings": True,
+            },
         )
         # TODO: Support autocommit_dml_mode as a connection variable in execution
         #       options.