MLU devices : Checks if mlu is available via an cndev-based check which won't trigger the drivers and leave mlu

[huismiling]

What does this PR do?

MLU devices : Checks if mlu is available via an cndev-based check which won't trigger the drivers and leave mlu

Check devices(cuda and mlu) is available with patch_environment .

Move clear_environment and patch_environment into src/accelerate/utils/environment.py to avoid circular import .

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• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• [ ] Did you write any new necessary tests?

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[huismiling]

@BenjaminBossan @muellerzr Previous PR https://github.com/huggingface/accelerate/pull/3057 is closed. Sorry for taking so long time to fix circular import. clear_environment and patch_environment are moved into src/accelerate/utils/environment.py .

[HuggingFaceDocBuilderDev]

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[muellerzr]

Yep exactly. We can add a deprecation warning here but we've never advertised it in that way at that import level so I think we should be fine.

[BenjaminBossan]

Okay, great, just wanted to be sure. This PR is good to be merged from my point of view.