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>
