[3.12] gh-118761: Revert "Improve import time of `subprocess` (GH-129427)" (GH-130201) (#130205)

gh-118761: Revert "Improve import time of `subprocess` (GH-129427)" (GH-130201)

* Revert "gh-118761: Improve import time of `subprocess` (GH-129427)"

This reverts commit 49f24650e4541456872490ec2b59d6d186204891.
Also known as f502c8f6a6db4be27c97a0e5466383d117859b7f in 3.13 (PR GH-129447)
Also known as f65aa0d1bf7b636ab8f9d226429205854b24cd7a in 3.12 (PR GH-129448)

This caused bugs in the `__del__` finalizer:
 https://github.com/python/cpython/issues/118761#issuecomment-2661504264

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(cherry picked from commit ae3064608935367c860182dc1b364631082ecdff)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>