skip more tests

Author: shuoweil

tests/system/small/bigquery/test_ai.py

@@ -273,6 +273,7 @@ def test_ai_if(session):
     assert result.dtype == dtypes.BOOL_DTYPE
 
 
+@pytest.mark.skip(reason="b/457416070")
 def test_ai_if_multi_model(session):
     df = session.from_glob_path(
         "gs://bigframes-dev-testing/a_multimodel/images/*", name="image"
@@ -293,6 +294,7 @@ def test_ai_classify(session):
     assert result.dtype == dtypes.STRING_DTYPE
 
 
+@pytest.mark.skip(reason="b/457416070")
 def test_ai_classify_multi_model(session):
     df = session.from_glob_path(
         "gs://bigframes-dev-testing/a_multimodel/images/*", name="image"