worker: call CancelTerminateExecution() before exiting Locker

As the comment indicates, this fixes a DCHECK failure, although I don’t
quite understand why it is happening in the first place.

PR-URL: https://github.com/nodejs/node/pull/33347


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>