[3.13] gh-109263: Start process from spawn context in multiprocessing no longer have side effect (GH-135813) (#143116)

gh-109263: Start process from spawn context in multiprocessing no longer have side effect (GH-135813)
(cherry picked from commit c2202a7e661d40b1837cc0109cdb9ab40ec4e486)

Co-authored-by: AN Long <aisk@users.noreply.github.com>