Backport gh-140485: Catch ChildProcessError in multiprocessing resource tracker

Summary:
upstream issue: python/cpython#140485
upstream PR: python/cpython#141132

background:
python/cpython#88887 was fixed in python/cpython#131530 and included in Python 3.12.10, but this introduced a new issue that was fixed in 3.13+ but was too late to get into the 3.12 branch
so cherry-picking the fix into Meta Python 3.12, since we're running into this

Reviewed By: parulgupta1004

Differential Revision: D89418469

fbshipit-source-id: a26c1d4836ae4e9859657eb1dccd98d10af855eb

Author: itamaro

Lib/multiprocessing/resource_tracker.py

@@ -108,7 +108,12 @@ def _stop_locked(
         close(self._fd)
         self._fd = None
 
-        waitpid(self._pid, 0)
+        try:
+            waitpid(self._pid, 0)
+        except ChildProcessError:
+            self._pid = None
+            self._exitcode = None
+            return
         self._pid = None
 
     def getfd(self):