[jdk21u-dev] RFR: 8355278: Improve debuggability of com/sun/jndi/ldap/LdapPoolTimeoutTest.java test

[Goetz Lindenmaier]

I backport this for parity with 21.0.11-oracle.

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Commit messages:
 - Backport 6befc189741069cc4b188e4822541fb9ab72ee28

Changes: https://git.openjdk.org/jdk21u-dev/pull/2589/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2589&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355278
  Stats: 34 lines in 1 file changed: 14 ins; 9 del; 11 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2589.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2589/head:pull/2589

PR: https://git.openjdk.org/jdk21u-dev/pull/2589