Leave native save as False

[muellerzr]

What does this PR do?

We only care if the model is saved in safetensors, general objects should never be if registered.. As a result makes save follow the same notion as Accelerator.save where safe_serialization is False by default. It can remain true for save_model and save_state however.

Fixes #2135

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@BenjaminBossan

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[SunMarc]

Thanks for the fixes !