[code-reflection] RFR: Use JUnit instead of TestNG [v2]

[Maurizio Cimadamore]

On Mon, 15 Sep 2025 14:34:33 GMT, Mourad Abbay <mabbay at openjdk.org> wrote:

>> (for the records, I'm not suggesting we tackle this in this PR -- more noting for "future work")
>
> Actually, "plain" test should be in the runtime tests directory.

Or that :-)

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PR Review Comment: https://git.openjdk.org/babylon/pull/566#discussion_r2349261456