[jdk21u-dev] RFR: 8361253: CommandLineOptionTest library should report observed values on failure

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport f153e415d740f4ede272929171e9bb3e73ddbe1c

Changes: https://git.openjdk.org/jdk21u-dev/pull/2310/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2310&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361253
  Stats: 7 lines in 1 file changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2310.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2310/head:pull/2310

PR: https://git.openjdk.org/jdk21u-dev/pull/2310