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

[Per Minborg]

> 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

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25177/files
  - new: https://git.openjdk.org/jdk/pull/25177/files/82e68046..7bf3be63

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25177&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25177&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25177.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25177/head:pull/25177

PR: https://git.openjdk.org/jdk/pull/25177