[jdk21u-dev] RFR: 8345375: Improve debuggability of test/jdk/java/net/Socket/CloseAvailable.java

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle

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Commit messages:
 - Backport 4b928167435bbf41dd00425c927da761751ca704

Changes: https://git.openjdk.org/jdk21u-dev/pull/1348/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1348&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345375
  Stats: 128 lines in 1 file changed: 37 ins; 12 del; 79 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1348.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1348/head:pull/1348

PR: https://git.openjdk.org/jdk21u-dev/pull/1348