RFR: 8328670: Automate and open source few closed manual applet test

[Abhishek Kumar]

Few manual closed applet test converted to automated and open sourced.

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Commit messages:
 - Open source manual applet test

Changes: https://git.openjdk.org/jdk/pull/18428/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18428&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328670
  Stats: 291 lines in 2 files changed: 291 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18428.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18428/head:pull/18428

PR: https://git.openjdk.org/jdk/pull/18428