Catalog Migrator: Fix META-INF legal files and exclude Hadoop webapps

[ajantha-bhat]

Summary

• add clean Apache LICENSE and project NOTICE files to every non-shadow Catalog Migrator JAR under META-INF
• retain the curated bundle legal files in the shaded CLI JAR
• exclude unused Hadoop webapps resources from the shaded CLI JAR
• remove jQuery, jQuery UI, and DataTables entries that are no longer bundled

This addresses the 1.1.0 RC0 vote feedback about missing META-INF/LICENSE and META-INF/NOTICE files in the API artifacts and the bundled jquery.jstree.js resource.

The JAR-specific legal files follow the approach used by Apache Polaris and avoid including distribution-only Gradle wrapper licensing in Maven artifacts.

Verification

• ./gradlew clean check -x spotlessKotlinCheck
• ./gradlew assemble
• ./gradlew spotlessKotlinGradleCheck
• verified every API, API-test, CLI, source, and Javadoc JAR contains exactly one META-INF/LICENSE and META-INF/NOTICE
• verified the shaded CLI JAR contains no webapps/** resources and its embedded legal files match BUNDLE-LICENSE and BUNDLE-NOTICE
• git diff --check

The standalone spotlessKotlinCheck task is currently blocked locally by a ktfmt Parser initialization error affecting all buildSrc Kotlin files.

[ajantha-bhat]

Similar to main repo apache/polaris@0fe89ec

[ajantha-bhat]

@snazy and @jbonofre : Please take a look, this should address RC0 issues.

[ajantha-bhat]

ping @jbonofre, @snazy

[jbonofre]

I'm reviewing it now.

[ajantha-bhat]

@jbonofre: Thanks for the review. Please take another look. Locally verified that no empty gradle folder exist now. I will fix the same in polaris main repo also.

[ajantha-bhat]

@jbonofre:
I used codex and didn't observe it created PR on release branch instead of main.
I can make a new RC from release branch. But we should have this fix on main branch too.

Please approve this clean cherry-pick: #271