[3.14] gh-134954: Hard-cap max file descriptors in subprocess test fd_status (GH-134955) (#134980)

gh-134954: Hard-cap max file descriptors in subprocess test fd_status (GH-134955)

* Hard-cap max file descriptors in subprocess test fd_status

On some systems, `SC_OPEN_MAX` may return a very large value (i.e. 10**30), leading to the subprocess test timing out (or run forever).
Prevent this situation by applying a hard cap on how many file descriptors are checked.

* Fix typo in usage docstring

s/fd_stats/fd_status/
(cherry picked from commit f58873e4b2b7aad8e3a08a6188c6eb08d0a3001b)

Co-authored-by: Itamar Oren <itamarost@gmail.com>