RFR: 8361950: Update to use jtreg 8 [v3]

[Alan Bateman]

On Sat, 30 Aug 2025 05:27:47 GMT, Christian Stein <cstein at openjdk.org> wrote:

> > Is there an ETA for integration?
> 
> On September, 1st.

I had a brief discussion with Christian about maybe holding off until the TIMEOUT_FACTOR changes (pull/26749) is integrated.

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PR Comment: https://git.openjdk.org/jdk/pull/26261#issuecomment-3239335012