[3.13] gh-125716: Use a Global Mutex When Initializing Global State For the _interpqueues Module (gh-125817)

This includes a drive-by cleanup in _queues_init() and _queues_fini().

This change also applies to the _interpchannels module.

(cherry picked from commit 4848b0b92ce2737cea08fa3b322fd0f0a671bb07, AKA gh-125803)

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>