KIP-318 — Make Kafka Connect Source idempotent

Discussion Kafka 3.2 ConnectTransactions

Enables idempotent producers in Kafka Connect Source connectors by enabling `enable.idempotence=true` so that at-least-once delivery from sources is automatically deduplicated by the broker. Connect sources already configured `acks=all` and `max.in.flight.requests.per.connection=1` but did not activate the idempotent producer, leaving duplicate records possible on retries.

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