Remove fetch in clang-tidy setup (#60974)
Summary:
This was necessary previously since we'd have to diff against upstream in order to figure out what to run in clang-tidy, but now we pull this from GitHub https://github.com/pytorch/pytorch/issues/60045 so we can delete this part of the workflow
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60974
Reviewed By: mruberry
Differential Revision: D29466036
Pulled By: driazati
fbshipit-source-id: a9d619ab731e77bc69ab32b37cfb2c249e22a477
