Fix dev getStaticPaths/generateStaticParams calling (#48322)
Since exiting in `setTimeout()` can cause a race condition with sending
the result from the worker and we don't want to destroy workers when
trying to leverage them as it has a perf impact this ensures we create
unique workers per usage and destroy them afterwards.
x-ref: https://github.com/vercel/next.js/pull/47716
Fixes: https://github.com/vercel/next.js/issues/48061
