HV-1591 Log warning when `@Valid` is used improperly

[DavideD]

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Fix https://hibernate.atlassian.net/browse/HV-1591

I've updated the log4j configuration because changing it wasn't having any effect. Not sure if there's a way to test that's actually logging.

I can add a test that shows the log (if you need it), but it's not really a test.

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[hibernate-github-bot[bot]]

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[DavideD]

It's possible to see the log via this test: https://github.com/hibernate/hibernate-validator/commit/b762667d4da175e16f1ffd5151921d0fc51a772d

[DavideD]

Thanks @marko-bekhta, I will update the pr

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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