Revert "Implement sparse semantics support in gradcheck (#94714)" (#95386)
This reverts commit 7ac511c29ad365f6dc078b8353d9c189720970a2 from https://github.com/pytorch/pytorch/pull/94714 since it breaks periodic.
Git thinks there's a merge conflict due to an unfortunately located newline deletion, so reverting this one manually
Details behind the failure in https://github.com/pytorch/pytorch/pull/94714#issuecomment-1442160593
Pull Request resolved: https://github.com/pytorch/pytorch/pull/95386
Approved by: https://github.com/clee2000
