RFR: 8333526: Restructure java/nio/channels/DatagramChannel/StressNativeSignal.java to a fail fast exception handling policy

[serhiysachkov]

This task addresses the restructuring of the test to handle exception, especially during test setup, in a more immediate "fail fast" manner.

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Commit messages:
 - 8333526: Restructure java/nio/channels/DatagramChannel/StressNativeSignal.java to a fail fast exception handling policy

Changes: https://git.openjdk.org/jdk/pull/27294/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27294&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333526
  Stats: 56 lines in 1 file changed: 0 ins; 27 del; 29 mod
  Patch: https://git.openjdk.org/jdk/pull/27294.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27294/head:pull/27294

PR: https://git.openjdk.org/jdk/pull/27294