[jdk21u-dev] RFR: 8324937: GHA: Avoid multiple test suites per job

[Aleksey Shipilev]

Clean backport to cover GHA testing gap.

Additional testing:
 - [ ] GHA

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Commit messages:
 - Backport 1aba78f2720b581f18fc2cec5e84deba6b2bcd41

Changes: https://git.openjdk.org/jdk21u-dev/pull/230/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=230&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324937
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/230.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/230/head:pull/230

PR: https://git.openjdk.org/jdk21u-dev/pull/230