KIP-950 — Tiered Storage Disablement

Accepted Kafka 3.9 Tiered Storage

Adds the ability to disable Tiered Storage on a per-topic basis after it has been enabled, including draining remote segments back to local storage before disabling. KIP-405 introduced Tiered Storage enablement but provided no mechanism to reverse it, leaving operators without a path to recover topics from tiered storage or roll back the feature.

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