* pass a logger instead of embedding on job
* leverage mlog.Millis
* use worker logger with HandleJobPanic
* rely on existing LogClone instead
* guard Job.LogClone against nil Job
* s/workername/worker_name
* Revert "rely on existing LogClone instead"
This reverts commit 17303cbac90d4b01815abca1309b78b97de368fb.
* Revert "guard Job.LogClone against nil Job"
This reverts commit f1ae22dee58d76f084582857830ffe8d4c546d7e.
If GetJob fails, we would return a nil job and then try to log
with that. To prevent this, we keep a reference to the old job
and log with that in the error case.
https://mattermost.atlassian.net/browse/MM-54580
```release-note
Fix a panic where a simple worker would crash if if failed to get a job.
```