RFR: 8352678: Opensource few JMenuItem tests

[Prasanta Sadhukhan]

Few JMenuItem tests are opensourced

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Commit messages:
 - 8352678: Opensource few JMenuItem tests

Changes: https://git.openjdk.org/jdk/pull/24273/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24273&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352678
  Stats: 336 lines in 4 files changed: 336 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24273.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24273/head:pull/24273

PR: https://git.openjdk.org/jdk/pull/24273