KIP-604 — Remove ZooKeeper Flags from the Administrative Tools

Accepted Kafka 2.6 AdminKRaft

Removes the deprecated `--zookeeper` flag from all Kafka administrative CLI tools (`kafka-topics.sh`, `kafka-consumer-groups.sh`, etc.), completing the migration to broker-based APIs. Previous KIPs (KIP-455, KIP-497, KIP-554, KIP-543) added the broker-side equivalents and KIP-555 deprecated the ZooKeeper flags; this KIP finalizes their removal as part of the KIP-500 ZooKeeper elimination effort.

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