### What?
Exit process after `payload jobs:run` without cron is executed
### Why?
I would expect the `payload jobs:run` command to exit normally after
execution. With mongodb this is not the case as database connections are
open so the node process itself will not exit.
### How?
Execute `payload.db.destroy` to close all db connections after queue is
execution is done.
Fixes: #9851
eb69885a89