Do not log a stream completion exception as failed message consumption

* This will appear as failure in the connection metrics for consumed messages
  which is wrong because it's not related to a consumed message

Signed-off-by: Yannic Klem <yannic.klem@bosch.io>

connectivity/service/src/main/java/org/eclipse/ditto/connectivity/service/messaging/kafka/KafkaConsumerActor.java

@@ -262,12 +262,6 @@ private void handleStreamCompletion(@Nullable final Done done, @Nullable final T
                 log.debug("Consumer failed with error! <{}: {}>", throwable.getClass().getSimpleName(),
                         throwable.getMessage());
                 status = connectivityStatusResolver.resolve(throwable);
-                final ConnectivityInternalErrorException exception = ConnectivityInternalErrorException.newBuilder()
-                        .cause(throwable)
-                        .message(throwable.getMessage())
-                        .description("Unexpected consumer failure.")
-                        .build();
-                inboundMonitor.exception(exception);
                 escalate(throwable, "Unexpected consumer failure.");
             }
             final ResourceStatus statusUpdate = ConnectivityModelFactory.newStatusUpdate(