Add ignore_errors=True to trainer.py rmtree in _inner_training_loop

[njbrake]

What does this PR do?

Fixes #17265

ignore_errors was already put into on rmtree call via #20984, but appears to have missed the call that happens in the _inner_training_loop

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Who can review?

Adding
@amyeroberts @sgugger since they had been corresponding on the linked issue

[muellerzr]

Thanks!

[HuggingFaceDocBuilderDev]

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[amyeroberts]

Thanks for opening this PR!