RFR: 8352687: Opensource few JInternalFrame and JTextField tests

[Prasanta Sadhukhan]

Few JInternalFrame and JTextField tests are opensourced

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Commit messages:
 - Opensource test

Changes: https://git.openjdk.org/jdk/pull/24474/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24474&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352687
  Stats: 358 lines in 4 files changed: 358 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24474.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24474/head:pull/24474

PR: https://git.openjdk.org/jdk/pull/24474