Revert "[Autograd] Cond Higher-Order Operation (pytorch#126911)"

This reverts commit f7058b7.

Reverted pytorch#126911 on behalf of https://github.com/clee2000 due to broke lint and functorch/test_aotdispatch https://hud.pytorch.org/pytorch/pytorch/commit/f7058b735e52a1d876912f8c96a594673a495007 Probably a landrace since both the test and lint passed on PR ([comment](pytorch#126911 (comment)))

Author: pytorchmergebot