Revert "Add FakeCrossRef tests for backwards, Fix Layer Norm Backward Decomp (#85417)"
This reverts commit 78afa0cf0ca04ce437ca4b519f07c04e73fe0d4c.
Reverted https://github.com/pytorch/pytorch/pull/85417 on behalf of https://github.com/clee2000 due to broke tests on trunk https://hud.pytorch.org/pytorch/pytorch/commit/78afa0cf0ca04ce437ca4b519f07c04e73fe0d4c
