[jdk21u-dev] RFR: 8327980: Convert javax/swing/JToggleButton/4128979/bug4128979.java applet test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle.

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Commit messages:
 - Backport 256d48b19694e86bb26d67ed56de8ac94a31f4ff

Changes: https://git.openjdk.org/jdk21u-dev/pull/2493/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2493&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327980
  Stats: 333 lines in 3 files changed: 149 ins; 184 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2493.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2493/head:pull/2493

PR: https://git.openjdk.org/jdk21u-dev/pull/2493