[GITHUB-6925] Fixing debugger tests.

[lahodaj]

It is my understanding failing tests for java/debugger.jpda.truffle may become an impediment to adopt JDK 21. So, this is an attempt to show a possible direction to fix the debugger.jpda.truffle tests. Instead of running the GraalVM launcher (which no longer exists), run java with the appropriate launcher class.

This patch currently only fixes JS, as that's what we already have/bundle. Hopefully support for R/Python/Ruby could be added, by downloading the appropriate libraries (if they exist) and adding the to the runtime classpath. I didn't try myself, though. Please feel free to enhance the patch.

A good property is that the tests no longer require the GraalVM, but can run on any supported JDK.

I did not (yet?) do updates to the GraalVM ${{ matrix.graal }} Tests GitHub Actions job. Should this be moved to GraalVM 21?

Please let me know what you think.

/cc @mbien , @JaroslavTulach

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