[jdk21u-dev] RFR: 8327755: Convert javax/swing/JScrollBar/8039464/Test8039464.java applet to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle

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Commit messages:
 - Backport 98e4b753e8d7fbbf651c866901734d4f6a7d1680

Changes: https://git.openjdk.org/jdk21u-dev/pull/1891/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1891&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327755
  Stats: 219 lines in 3 files changed: 95 ins; 124 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1891.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1891/head:pull/1891

PR: https://git.openjdk.org/jdk21u-dev/pull/1891