[kafka] Upgrade Cruise Control to 3.0.4 for Java 17 and Java 21 support

[jitender-goyal]

• Upgraded default CRUISE_CONTROL_VERSION to 3.0.4
• Added Java 21 and Gradle 8.5 compatibility
• Replaced hardcoded reporter jar path with wildcard cruise-control-metrics-reporter-*.jar
• Added --add-opens JVM options to KAFKA_OPTS for runtime reflection on Java 17+
• Preserved legacy build.gradle injection only for older 2.0.x branches

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[gemini-code-assist]

Code Review

This pull request updates the default Cruise Control version to 3.0.4 to support Java 17 and 21, conditionally applies legacy build patches for older versions, and adds JVM reflection options for modern Java runtimes. The review feedback suggests ensuring backward compatibility with Java 8 by conditionally applying the --add-opens JVM options, broadening the legacy version check regex to support all 2.x versions, and using a more specific file selection instead of a wildcard to avoid copying auxiliary jars to the Kafka classpath.

[jitender-goyal]

@vinayakumarb