Add support for posix_spawn call in subprocess.Popen with cwd != None

[kulikjak]

Feature or enhancement

Proposal:

Currently, posix_spawn is never used in subprocess calls when cwd argument is given. Many platforms pretty recently added posix_spawn_file_actions_addchdir_np() and/or posix_spawn_file_actions_addchdir() functions, which should make it pretty simple to add such support.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

It was mentioned here:
#109154 (comment)

Linked PRs

• WIP: gh-114467: Support posix_spawn in subprocess.Popen with cwd != None #114468