KIP-1179 — Introduce remote.log.manager.follower.thread.pool.size config

Accepted Kafka 4.2 Tiered Storage

Introduces a new dynamic broker config remote.log.manager.follower.thread.pool.size and deprecates the existing remote.log.manager.thread.pool.size which now exclusively handles follower partition tasks. The original config name was generic but its scope had narrowed to follower tasks after KIP-950, creating a naming mismatch; it also lacked dynamic reconfiguration support unlike the newer copier and expiration thread pool configs.

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