test: disable deprecated embedding model tests

[GarrettWu]

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Fixes #<issue_number_goes_here> 🦕

[shobsi]

The 3 tests marked deprecated are not the same as the 3 failing?

FAILED tests/system/small/ml/test_llm.py::test_create_text_embedding_generator_model_defaults
ERROR tests/system/small/ml/test_llm.py::test_create_embedding_generator_model_002
ERROR tests/system/small/ml/test_llm.py::test_create_embedding_generator_multilingual_model

[GarrettWu]

test_create_embedding_generator_multilingual_model

hmmm I retrieved from

https://fusion2.corp.google.com/ci/kokoro/prod:bigframes%2Fpresubmit%2Fpresubmit/activity/dfb811df-d049-4128-a7fe-76c35b698f94/invocations/dfb811df-d049-4128-a7fe-76c35b698f94/targets/bigframes%2Fpresubmit%2Fpresubmit/log

looks like test_create_embedding_generator_multilingual_model is also failing.

I'll do a further check.