Turn error backend off by default

[jeffkreeftmeijer]

The error backend is a relic of the past, which caught otherwise uncaught errors before we had proper instrumentation through library-specific instrumentation and :telemetry.

Also, the error backend produced confusing results, as the errors it reports are void of context, making them hard to understand at best.

This patch turns the error backend off by default if it's unconfigured, in preparation of removing the backend in a future version.

[jeffkreeftmeijer]

This is ready for review. Let's bite the bullet and flip the switch, as we don't see any valuable data coming in through the error handler.

[tombruijn]

Let's review if it is not really necessary. @jeffkreeftmeijer will take a look. It could be interesting to track process crashes rather than errors we didn't catch.

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• This Pull Request has been approved. Can it be merged @jeffkreeftmeijer? - (More info)

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