Rollback mechanism for /parquet-and-dataset-info

[lhoestq]

This job creates parquet files in Hub repos. When the admin cancel endpoint is called, we need to rollback the revert the commits that were done in the repo.

One way to do it would be to add the job ID in the commit description, this way we can know which commits to revert.

Though it may require to patch datasets a little to do that

[lhoestq]

Actually I just noticed that we do only one commit to the repository, which makes the job almost atomic, and the case where we would need a rollback should be super rare.

I wouldn't prioritize it for now.

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