Revert "[inductor] Parallelize Max Autotune step 1: Use Popen (#107982)"
This reverts commit d6856680039e5557b45e4cd6e95f82ca64f6435a.
Reverted https://github.com/pytorch/pytorch/pull/107982 on behalf of https://github.com/masnesral due to fbcode failures ([comment](https://github.com/pytorch/pytorch/pull/107982#issuecomment-1714818307))
