Handle Background Worker's exceptions

[petrspelos]

Summary

In case the background worker encounters and error, it should output it into its log instead of closing.

Alternatively the log file name could be appended with -failed.log to better recognize this scenario.

A general try/catch could work. Alternatively we can hook into the UnhandledException event of the runtime to be a bit more sure.

The exception should also be printed in the log itself.

Notes

Careful about exceptions that are coming from failed attempt at logging.

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