feat: upgrade to transformers v5

[yash4242]

Description of the change

Making fms-hf-tuning transformers v5 compatible

Related issue number

NA

How to verify the PR

run tests. As of now, some tests fail, most of which are due to a tensor size mismatch. This error comes inside the trainer.train() code

Was the PR tested

Yes.

• I have added >=1 unit test(s) for every new method I have added.
• I have ensured all unit tests pass
  Tests status as above. I tested out with 9 pytests as follows:

pytest tests/acceleration
pytest tests/build
pytest tests/data
pytest tests/trackers
pytest tests/trainercontroller
pytest tests/utils
pytest tests/test_sft_trainer.py

[github-actions]

Thanks for making a pull request! 😃
One of the maintainers will review and advise on the next steps.

[dushyantbehl]

Delete commented code...retain comments only in code files and not in test files.
fix the pyproject file as per comments.

[dushyantbehl]

Good progress @yash4242
minor changes requested along with updates to the dockerfile to match the incoming changes.