KIP-322 — Return new error code for DeleteTopics API when topic deletion disabled.

Discussion Kafka 2.1 AdminBroker

KIP-322 adds a new `TOPIC_DELETION_DISABLED` error code returned by the `DeleteTopics` API (v3+) when `delete.topic.enable=false` on the broker, replacing the previous behavior of silently timing out. Without a specific error code, the client receives a generic timeout exception with no indication that topic deletion is administratively disabled rather than temporarily unavailable.

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