Revert "[HigherOrderOp] expose torch.cond (#110293)"
This reverts commit 601f872831649bccf1069ac59b2ecfd0895a88e3.
Reverted https://github.com/pytorch/pytorch/pull/110293 on behalf of https://github.com/ydwu4 due to Sorry, didn't check the error carefully on the PR. A doc error is related to this pr ([comment](https://github.com/pytorch/pytorch/pull/110293#issuecomment-1751176719))
