KIP-1252 — AlterConfigPolicy compatibility in legacy Zookeeper mode (3.9.2 release)

Accepted Kafka 3.9.2 AdminBroker

Adds a boolean broker config alter.config.policy.kraft.compatibility.enable that, when true, makes AlterConfigPolicy.validate in ZooKeeper mode receive the post-operation config value (matching KRaft behavior) instead of the raw operation value. The behavioral difference between ZK and KRaft modes made it impossible to write a single policy that correctly validates Incremental Alter Config operations involving OpType.SUBTRACT or OpType.APPEND.

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