[jdk21u-dev] RFR: 8328124: Convert java/awt/Frame/ShownOnPack/ShownOnPack.html applet test to main

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport 7cc1965a252347f37dca69859d5ecaf2b55020c6

Changes: https://git.openjdk.org/jdk21u-dev/pull/2183/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2183&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328124
  Stats: 249 lines in 2 files changed: 4 ins; 207 del; 38 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2183.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2183/head:pull/2183

PR: https://git.openjdk.org/jdk21u-dev/pull/2183