test: exit sequence sanity tests

Execute JS code in worker through same vm context
while exiting from the main thread at arbitrary
execution points, and make sure that the workers
quiesce without crashing.

`worker_threads` are not necessarily the subject of
testing, those are used for easy simulation of
multi-thread scenarios.

Refs: https://github.com/nodejs/node/issues/25007

PR-URL: https://github.com/nodejs/node/pull/25085


Reviewed-By: Anna Henningsen <anna@addaleax.net>