remove the deprecated method init_git_repo

[statelesshz]

What does this PR do?

As docstring says init_git_repo is deprecated and will be removed in v4.34.0 of Transformers.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
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• Did you make sure to update the documentation with your changes? Here are the
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  here are tips on formatting docstrings.
• 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
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cc @muellerzr

[muellerzr]

Thanks! Can you run make style; make quality; to fix the failing issues?