src: expose ListNode<T>::prev_ on postmortem metadata

Make ListNode<T> postmortem easier to find last items in the queue.

PR-URL: https://github.com/nodejs/node/pull/30027


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>