[jdk17u-dev] RFR: 8328238: Convert few closed manual applet tests to main

[Andrew Lu]

I backport this for parity with 17.0.13-oracle.

-------------

Commit messages:
 - Backport 68170ae22233462e8925c75c4737be7f0ba9353d

Changes: https://git.openjdk.org/jdk17u-dev/pull/2656/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2656&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328238
  Stats: 395 lines in 4 files changed: 395 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2656.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2656/head:pull/2656

PR: https://git.openjdk.org/jdk17u-dev/pull/2656