[jdk21u-dev] RFR: 8333526: Restructure java/nio/channels/DatagramChannel/StressNativeSignal.java to a fail fast exception handling policy

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle

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Commit messages:
 - Backport 4f4030a423d04c8f488d143f0eda4a8de9dbd469

Changes: https://git.openjdk.org/jdk21u-dev/pull/2414/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2414&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333526
  Stats: 57 lines in 1 file changed: 0 ins; 27 del; 30 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2414.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2414/head:pull/2414

PR: https://git.openjdk.org/jdk21u-dev/pull/2414