RFR: 8361950: Update to use jtreg 8 [v2]

[Iris Clark]

On Mon, 11 Aug 2025 11:35:12 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review the change to update to using jtreg 8.
>> 
>> The primary change is to the `jib-profiles.js` file, which specifies the version of jtreg to use, for those systems that rely on this file. In addition, the requiredVersion has been updated in the various `TEST.ROOT` files.
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update to use correct library directories
>   
>   See also: https://openjdk.org/jtreg/faq.html#how-do-i-find-the-path-for-the-testng-or-junit-jar-files

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/26261#pullrequestreview-3106980594