Revert "Fix fake tensor kernel nesting (#85920)"
This reverts commit c2d9ea7f4b54c7d4332bc457fd76238c61f129de.
Reverted https://github.com/pytorch/pytorch/pull/85920 on behalf of https://github.com/huydhn due to Sorry for reverting your PR but I suspect that it causes a flaky memory leak issue in TestFakeTensorCUDA.test_fake_crossref_backward_amp_linalg_lstsq_cuda_float32
