RFR: 8354493: Opensource Several MultiScreen and Insets related tests

[Abhishek Kumar]

Several multi screen related Applet tests are converted to manual and open sourced.

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Commit messages:
 - Applet test converted and open-sourced

Changes: https://git.openjdk.org/jdk/pull/24654/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24654&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354493
  Stats: 481 lines in 3 files changed: 481 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24654.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24654/head:pull/24654

PR: https://git.openjdk.org/jdk/pull/24654