feat: Remove pmd-java JAR

What does this MR do?

Leaving as draft until tested more extensively

Removes unneeded pmd-java*.jar used for java analysis since we only rely on a subset of total PMD functionality for apex scans. While we could probably remove the remaining modules as well, this is a minimal change to reduce side-effects. This change indirectly removes any trace of log4j.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
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• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer