Remove skip_first_batches support for StatefulDataloader and fix all the tests

[muellerzr]

What does this PR do?

Fixes our variety of failing tests on main.

Namely:

• removes StatefulDataloader from skip_batch_sampler stuff. There is no need since the dataloader can resume itself, so we don't want users to do so by accident imo.
• Tweaks the pippy tests to deal with the changes, and adds one for bert (at this time, we can't support vision models, and they dropped support for encoder/decoder)
• RIP SD v1-5

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• Did you write any new necessary tests?

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@SunMarc

[HuggingFaceDocBuilderDev]

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[SunMarc]

Thanks for fixing the tests ! LGTM ! Just a nit