Add revision to trainer push_to_hub
Author: teamclouday
Pull request: yes

# What does this PR do?

Add revision to trainer's push_to_hub method. See #33481 


## Before submitting
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- [ ] Did you write any new necessary tests?


## Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

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Comments:
Thank you for the suggestions! Just made a new commit

perfect, the failing tests are unrelated to this PR.
cc @SunMarc for review

> Thanks for adding this @teamclouday ! Did you test the PR ?

I just added test code! Can run it with:
```bash
export HUGGINGFACE_CO_STAGING=1; python -m unittest -v tests.trainer.test_trainer.TrainerIntegrationWithHubTester.test_push_to_hub_with_revision
```

Currently with revision, the code is assuming that branch already exists. Wonder if it's necessary to automatically create new branch if not found.

Don't forget to format your files with `ruff`

> Don't forget to format your files with `ruff`

Thanks for reminder! Just applied the format

the `setup_and_quality` tests are still failing
This can be fixed by organizing the imports and you should be all good.

Just fixed the imports! Should be good now. Sorry about the back and forth

Can you rebase on main to make the CI green @teamclouday ? 

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_33482). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

I just rebased to main and CI is green now! Thank you all!