Don't publish luke jar to Maven Central

The "luke" module is listed in https://github.com/apache/lucene/blob/main/gradle/publishing/defaults-maven.gradle.

Luke is not a API but a packaged GUI tool so it doesn't much make sense to publish the jar itself to the Maven Central.

1) In 8.x the luke jar is intentionally excluded from the published JAR list, I think we should also exclude it on 9.0.

In addition, I think 2) we shouldn't publish the Javadocs of luke module https://lucene.apache.org/core/8_8_2/luke/index.html - it is supposed that the APIs are only used for internal purposes (from the GUI). Instead of linking to the Javadocs from https://lucene.apache.org/core/8_8_2/index.html, we could add a short guide to launch the Swing app.