[java] Make missing class warnings debug level

[oowekyala]

Ref #3914 and #4422

This makes the noisy warnings invisible unless you use --debug. The rest of the ticket is about making them visible but not so noisy, we can implement that later.

Describe the PR

Related issues

• Fixes #

Ready?

• Added unit tests for fixed bug/feature
• Passing all unit tests
• Complete build ./mvnw clean verify passes (checked automatically by github actions)
• Added (in-code) documentation (if needed)

[pmd-test]

	1 Message
📖	Compared to master: This changeset changes 0 violations, introduces 0 new violations, 0 new errors and 0 new configuration errors, removes 0 violations, 0 errors and 0 configuration errors. Full report

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[adangel]

Thanks!