[issue38435] Start the deprecation cycle for subprocess preexec_fn

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

A worthwhile general suggestion on a new path forward for the mess of things between (v)fork+exec from Victor is over in https://bugs.python.org/issue42736#msg383869

TL;DR creating a subprocess.Preexec() recording object with specific interfaces for things that can be done, an instance of which gets passed in and the recorded actions are done as appropriate.

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versions: +Python 3.11 -Python 3.10

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