[3.15] gh-119710: fix asyncio Process.wait() to finish on process exit and not wait...

[3.15] gh-119710: fix asyncio Process.wait() to finish on process exit and not wait for closing of pipes (GH-151983) (#154170)

* gh-119710: fix asyncio Process.wait() to finish on process exit and not wait for closing of pipes (GH-151983)
(cherry picked from commit f2521324e6bdf331460abec7c2a88e2d3736b91c)

Co-authored-by: Tobias Alex-Petersen <tobias.alex.petersen@gmail.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>