RFR: 8361950: Update to use jtreg 8 [v4]

[Alan Bateman]

On Sat, 6 Sep 2025 01:04:56 GMT, Chen Liang <liach at openjdk.org> wrote:

> #26749 was merged 4 days ago. Can we integrate this one now?

I think it would be useful to get input from @dholmes-ora and @lkorinth before doing this.  There seems to be several timeout issues in the last few days, a few follow-on changes to adjust the timeout of a few tests, and a spate of tests being reported as timed out after passing.  Updating jtreg adds another change to the picture.

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PR Comment: https://git.openjdk.org/jdk/pull/26261#issuecomment-3261436239