fix(trainer): Avoid moving model with device_map
Author: The5cheduler
Pull request: yes

Fix #41013 

When a model is loaded with `device_map="auto"` and is too large to fit on a single GPU, `accelerate` will offload some layers to the CPU or disk. The `Trainer` would previously attempt to move the entire model to the specified device, causing a `RuntimeError` because a model dispatched with `accelerate` hooks cannot be moved.

This commit fixes the issue by adding a check in `_move_model_to_device` to see if the model has an `hf_device_map` attribute. If it does, the device placement is assumed to be handled by `accelerate`, and the `model.to(device)` call is skipped.

A regression test is added to ensure the `Trainer` can be initialized with a model that has a `hf_device_map` that simulates offloading without raising an error.

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Comments:
cc @sunmarc

Hi @SunMarc 
Just Added the Logger Warning for training.

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_41032). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.