Revert "Multiprocessing support for NT (#110292)"
This reverts commit 881e7304d6315c17953fa5b9bc1dfe07dcb7d166.
Reverted https://github.com/pytorch/pytorch/pull/110292 on behalf of https://github.com/jbschlosser due to Address review comments ([comment](https://github.com/pytorch/pytorch/pull/110292#issuecomment-1743524901))
