[jdk21u-dev] RFR: 8340306: Add border around instructions in PassFailJFrame

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 0120d3eed50bdc9fa53f2c41b31791620aeef613

Changes: https://git.openjdk.org/jdk21u-dev/pull/1083/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1083&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340306
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1083.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1083/head:pull/1083

PR: https://git.openjdk.org/jdk21u-dev/pull/1083