[jdk21u-dev] RFR: 8327879: Convert javax/swing/border/Test4760089.java applet test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle,

-------------

Commit messages:
 - Backport a68f5d7331c2e6c4bc51eee95abcbabb5a19b484

Changes: https://git.openjdk.org/jdk21u-dev/pull/2045/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2045&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327879
  Stats: 71 lines in 2 files changed: 25 ins; 35 del; 11 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2045.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2045/head:pull/2045

PR: https://git.openjdk.org/jdk21u-dev/pull/2045