fix: handle worker termination after worker exit

[r00b]

Setting closeWorkerAfterMs causes for the worker to be terminated after the specified time. However, if the worker completes and exits normally before closeWorkerAfterMs milliseconds, the timeout created upon worker init is not cleared. This causes a TypeError where this.workers[name] is undefined and thus this.workers[name].terminate cannot be read or called. This PR adds a check upon timeout to ensure that this.workers[name] exists before calling terminate. This PR also fixes the test case run > job terminates after set time, which was not actually a proper test since the Promise in the test case was not awaited. The test failed to ensure that a worker that was properly terminated when termination was disabled.

I realized during the fix that there is a generic stop function that performs several cleanup tasks, one of which is clearing the timout set by closeWorkerAfterMs. I wasn't sure if it was appropriate to call stop during the exit stage of the worker, since the worker would technically already be stopped, so I leave it up to the maintainers to advise.

[niftylettuce]

Excellent catch, thank you @robertsteilberg, appreciate the PR as well - it truly helps! 👏 🙇

Published v1.1.21 to npm and published deprecation notice for all versions prior.

https://github.com/breejs/bree/releases/tag/v1.1.21