comminity[patch]: fix #25575 YandexGPTs for _grpc_metadata

[mkhludnev]

it fixes two issues:

YGPTs are broken #25575

File ....conda/lib/python3.11/site-packages/langchain_community/embeddings/yandex.py:211, in _make_request(self, texts, **kwargs)
..
--> 211 res = stub.TextEmbedding(request, metadata=self._grpc_metadata)  # type: ignore[attr-defined]

AttributeError: 'YandexGPTEmbeddings' object has no attribute '_grpc_metadata'

My gut feeling that #23841 is the cause.

I have to drop leading underscore from _grpc_metadata for quickfix, but I just don't know how to do it pydantic enough.

minor issue:

if we use api_key, which is not the best practice the code fails with

File ~/git/...../python3.11/site-packages/langchain_community/embeddings/yandex.py:119, in YandexGPTEmbeddings.validate_environment(cls, values)
...

AttributeError: 'tuple' object has no attribute 'append'

• Added new integration test. But it requires YGPT env available and active account. I don't know how int tests dis\enabled in CI.
• added small unit tests with mocks. Should be fine.

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[mkhludnev]

ok. My unittests requires yandexcloud dependency. Can we add yandexcloud into extended_testing_deps.txt?

[mkhludnev]

Changed one test working without yandexcloud dependency. 41dc558
Let me know if it makes sense, I'll move toward two remaining unittests.

[mkhludnev]

although it suffer from ModuleNotFoundError: No module named 'grpc'
I'll take one more attempt

[mkhludnev]

@tyumentsev4 wdyt?

[mkhludnev]

@eyurtsev may I ask your attention?