Update exception parser

[mookid8000]

Exception parser does not handle Rebus 8 exceptions very well. 😅

When extracting the exception type, it'll look like this:

ExceptionInfo { Type = System.AggregateException, mscorlib, Message = 5 unhandled exceptions, Details = 15-05-2023 18

and in this case it would have been neat if the parser would drill into the exception details and extract the most recent exception contained in the AggregateException