Revert "Add FakeCrossRef tests for backwards, Fix Layer Norm Backward Decomp (#85417)"
This reverts commit 9c77083965e1283763a83f72a3adf299281761e3.
Reverted https://github.com/pytorch/pytorch/pull/85417 on behalf of https://github.com/clee2000 due to broke tests on trunk (and pull somehow) https://hud.pytorch.org/pytorch/pytorch/commit/9c77083965e1283763a83f72a3adf299281761e3
