Revert "More forward AD formulas"
This reverts commit 6b20ef6b917aaaf332d10d9e65e2854ff79965f0.
Reverted https://github.com/pytorch/pytorch/pull/77975 on behalf of https://github.com/janeyx99 due to I think this is the real culprit of the broken tests in https://hud.pytorch.org/pytorch/pytorch/commit/28a7ee8cec122d6f6c9a9b891b7cc6bb8224c9a7 for the trunk-only slow test job
