KIP-817 — Fix inconsistency in dynamic application log levels

Discussion Admin

Fixes inconsistencies in the dynamic log-level adjustment API introduced by KIP-412, specifically adding support for `OFF` and `ALL` log levels and returning an error instead of silently falling back to `DEBUG` for unrecognized level strings. The JMX-based approach and the Admin API approach behave differently for these edge cases, making dynamic log management unreliable.

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