Throw UnrecoverableMessageHandlingException on 4xx #1235
Merged
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When we try to deliver an activity to an inbox and receive a 4xx status code other than the 429 for rate limiting we now discard that message, so it will not get retried. This also doesn't count as a failed delivery to the instance anymore, because the instance is up, it just didn't accept the activity. TransportExceptions are now caught as well, since those are the ones we get when an instance is down