KIP-719 — Deprecate Log4J Appender

Accepted Kafka 3.8 Broker

KIP-719 deprecates the `kafka-log4j-appender` module, which ships the legacy Log4j 1.x `KafkaAppender`, from the Apache Kafka distribution. The appender's dependency on Log4j 1.x (EOL, CVE-affected) conflicts with the Log4j2 upgrade done elsewhere in the codebase, causing both Log4j versions to coexist on the classpath with unpredictable behavior.

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