RFR: 8327840: Automate javax/swing/border/Test4129681.java

[Tejesh R]

Automated the Test `javax/swing/border/Test4129681.java` from manual as suggested in JBS description.
Verified in CI system and its Green. The test has been verified for Metal L&F and the same is set explicitly..

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Commit messages:
 - Test converted to automated

Changes: https://git.openjdk.org/jdk/pull/18336/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18336&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327840
  Stats: 60 lines in 1 file changed: 24 ins; 11 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/18336.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18336/head:pull/18336

PR: https://git.openjdk.org/jdk/pull/18336