RFR: 8356658: java/foreign/TestBufferStackStress2.java failed again with junit action timed out [v6]

[Per Minborg]

On Mon, 12 May 2025 14:41:27 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR proposes to add a safety net around closing the executor. Apparently, in some rare configuration, the VT is not run/notified correctly.
>> 
>> Not completing the test for such a configuration is unlikely to mask potential issues that this test is supposed to reveal.
>
> Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove delimiter between JBS issues

Test run in tier5 passes now. Thanks for the reviews and suggestions for improvement here!

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PR Comment: https://git.openjdk.org/jdk/pull/25177#issuecomment-2875116994