CORE-17012 dlq topic to be used by multi source mediator for producer serialization errors #1304
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It is not possible for a multi source mediator to determine which topic a record came from which triggered an output record that failed to serialize and therefore should be DLQ'd.
Adding a common topic for all mediators to send a DLQ record for to record serialization failures.
Open to debate whether we should even bother DLQing this records. However as we DLQ these in the S+E this seems the only way to preserve that logic