Add isolation mode exclusion for mapped operator test (apache#43297)

This test has been cherry-picked to v2-10-test and should be
excluded from isolation mode.

tests/models/test_mappedoperator.py

@@ -731,6 +731,7 @@ def test_expand_mapped_task_instance_with_named_index(
     assert indices == expected_rendered_names
 
 
+@pytest.mark.skip_if_database_isolation_mode  # Does not work in db isolation mode
 @pytest.mark.parametrize(
     "create_mapped_task",
     [