RFR: 8316106: Open source few swing JInternalFrame and JMenuBar tests [v2]

[Abhishek Kumar]

> Few closed JInternalFrame and JMenuBar swing tests are open sourced.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  Review comment update

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15735/files
  - new: https://git.openjdk.org/jdk/pull/15735/files/9c6e3254..5a458d99

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15735&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15735&range=00-01

  Stats: 16 lines in 2 files changed: 10 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/15735.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15735/head:pull/15735

PR: https://git.openjdk.org/jdk/pull/15735