RFR: 8352685: Opensource JInternalFrame tests - series2

[Prasanta Sadhukhan]

Few JInternalFrame tests are opensourced

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Commit messages:
 - 8352685: Opensource JInternalFrame tests - series2

Changes: https://git.openjdk.org/jdk/pull/24285/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24285&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352685
  Stats: 378 lines in 4 files changed: 378 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24285.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24285/head:pull/24285

PR: https://git.openjdk.org/jdk/pull/24285