File mp_preload_large_sysargv.py

Lib/test/mp_preload_large_sysargv.py:None–None

# gh-144503: Test that the forkserver can start when the parent process has
# a very large sys.argv.  Prior to the fix, sys.argv was repr'd into the
# forkserver ``-c`` command string which could exceed the OS limit on the
# length of a single argv element (MAX_ARG_STRLEN on Linux, ~128 KiB),