KIP-758 — Remove list of latest producer append information for broker

Discussion BrokerProducer

Reduces the per-producer-per-partition append cache in brokers from storing the 5 most recent batch writes to storing only the 1 most recent, reducing memory consumption. The per-PID append cache is used to deduplicate retried produce requests; storing 5 entries per PID per partition causes OOM in production clusters with many producers.

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