Do not take "DSNPId not found" as an error #185
Description
Right now when webhook returns 404 "DSNPId not found" error response it eventually triggers event webhook.gone, which triggers calling healthchecks and so on, but that is clearly not an issue with webhook but just a use case, when provider doesn't have that user on their platform anymore. I've noticed that reconnection service is trying to call webhook for such msaId 18 times in total and of course all of them will "fail" the same way. Maybe we can introduce some error json structure with maybe some known error codes to handle them different way to avoid such situation.