RFR: 8336332: Rework tests to avoid unrelated stderr output [v9]

[Andy Goryachev]

On Thu, 18 Sep 2025 18:12:17 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> my version is _more efficient_ :-)
>
> I doubt it. Anyway, it doesn't really matter all that much.

off topic, but it is more efficient - check out

https://github.com/andy-goryachev-oracle/Test/blob/main/src/goryachev/research/MoreEfficient.java

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PR Review Comment: https://git.openjdk.org/jfx/pull/1897#discussion_r2360677550