[jdk21u-dev] RFR: 8324659: GHA: Generic jtreg errors are not reported

[Aleksey Shipilev]

Clean backport to close the testing gap in GHA.

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Commit messages:
 - Backport c313d451a513eb08de0b295c1ce66d0d849d2374

Changes: https://git.openjdk.org/jdk21u-dev/pull/220/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=220&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324659
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/220.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/220/head:pull/220

PR: https://git.openjdk.org/jdk21u-dev/pull/220