Update legacy Repository usage in various example files
Author: Hvanderwilk
Pull request: yes

# What does this PR do?
The usage in the example is marked for deprecation here https://huggingface.co/docs/huggingface_hub/guides/upload#legacy-upload-files-with-git-lfs. Use the new recommended methods.

I've further removed the `epoch_/step_` gitignores, that seems a bit against the purpose of doing the intermediate push, for which some examples store models at an epoch.

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Comments:
> Thanks for updating! Could you extend this to all the other examples which use `Repository`?

@amyeroberts sure! Could you point out if I can find why the CI actions are failing? In the details it just shows as failed without any details. I ran the quality tools / tests locally and all seemed ok.

@Hvanderwilk Great - thanks! 

For the failing runs on CI there's two things you'll need to do to get things passing: 
* For the failing errors with pytest, rebasing onto main should resolve this
* For the quality checks running `make fixup` and pushing the changes should resolve this