RFR: 8345375: Improve debuggability of test/jdk/java/net/Socket/CloseAvailable.java

[Jaikiran Pai]

Can I please get a review of this test-only change which should improve the debuggability of the `test/jdk/java/net/Socket/CloseAvailable.java` test?

The test has been intermittently failing in our CI as noted in https://bugs.openjdk.org/browse/JDK-8269526. With these added logs in the test, I think it should help in the failure investigations in any future failures in this test.

Repeat testing of this test in our CI, with this change, has passed. A tier2 testing is in progress.

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Commit messages:
 - 8345375: Improve debuggability of test/jdk/java/net/Socket/CloseAvailable.java

Changes: https://git.openjdk.org/jdk/pull/22511/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22511&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/jdk/pull/22511.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22511/head:pull/22511

PR: https://git.openjdk.org/jdk/pull/22511