core: Log any exception during panic because of exception #11970
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panic() calls a good amount of code, so it could get another exception. The SynchronizationContext is running on an arbitrary thread and we don't want to propagate this secondary exception up its stack (to be handled by its UncaughtExceptionHandler); it we wanted that we'd propagate the original exception.
This second exception will only be seen in the logs; the first exception was logged and will be used to fail RPCs.
Also related to http://yaqs/8493785598685872128 and b692b9d