RFR: 8336332: Rework tests to avoid unrelated stderr output [v4]

[Andy Goryachev]

On Tue, 16 Sep 2025 20:14:55 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   moved utility
>
> modules/javafx.base/src/test/java/test/util/ErrorLoggingUtility.java line 184:
> 
>> 182:             // catches lines starting with things like "Exception in thread "main" java.lang.RuntimeException:"
>> 183:             "^" +
>> 184:             "(?:" +
> 
> This might be easier to read and maintain with text blocks.

it's a complete gibberish as continuous text.  not an easy thing to parse mentally.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1897#discussion_r2353583759