KIP-346 — Improve LogCleaner behavior on error

Accepted Kafka 2.1 Broker

Changes LogCleaner behavior on compaction failure from halting the entire cleaner thread (which stops all compaction) to pausing only the affected partition and logging the error with full context. Previously a single corrupt log or compaction bug would freeze all log compaction across the broker, silently leaving dirty partitions uncompacted until a broker restart.

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