Fix infinite loop in `_validate_not_a_forked_repo()` (#62072)
Summary:
Increase `page_idx` in the loop rather than outside of it
Break from the loop when receive empty response as it means there are no more items to fetch via pagination request
Also, add options to use provided github token (via `GITHUB_TOKEN` environment variable)
Fixes failure with "Rate Limit Exceeded" when doing something like `torch.hub.list("pytorch/test-infra:dsf")`
Fixes https://github.com/pytorch/pytorch/issues/61755
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62072
Reviewed By: jbschlosser
Differential Revision: D29868539
Pulled By: malfet
fbshipit-source-id: 206082a0ba1208e9b15ff6c9c6cb71d2da74f1c3
