RFR: 8328124: Convert java/awt/Frame/ShownOnPack/ShownOnPack.html applet test to main

[Alexander Zvegintsev]

The test is converted to main.
Tested on Linux, Macos and Windows.

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Commit messages:
 - 8328124: Convert java/awt/Frame/ShownOnPack/ShownOnPack.html applet test to main

Changes: https://git.openjdk.org/jdk/pull/18287/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18287&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328124
  Stats: 250 lines in 2 files changed: 4 ins; 208 del; 38 mod
  Patch: https://git.openjdk.org/jdk/pull/18287.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18287/head:pull/18287

PR: https://git.openjdk.org/jdk/pull/18287