RFR: 8352684: Opensource JInternalFrame tests - series1

[Prasanta Sadhukhan]

Few JIntenalFrame tests are opensourced

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Commit messages:
 - 8352684: Opensource JInternalFrame tests - series1

Changes: https://git.openjdk.org/jdk/pull/24447/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24447&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352684
  Stats: 304 lines in 4 files changed: 304 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24447.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24447/head:pull/24447

PR: https://git.openjdk.org/jdk/pull/24447