Torchhub: rewrite commit hash check to avoid using unnecessary GitHub API credits (#64362)
Summary:
This PR adds more detailed error messages to torchhub if the commit hash validation goes wrong, providing suggestions to the users on how to resolve the issue.
It also documents why such validation is important.
EDIT: it also avoids validatating some stuff when we know "stuff" isn't a commit since there's no risk in this case
CC malfet mthrok
cc nairbv NicolasHug
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64362
Reviewed By: gchanan, malfet
Differential Revision: D30731191
Pulled By: NicolasHug
fbshipit-source-id: d1ee7c2ef2591dd7a5291977af1635ada2552d1b
