[jdk17u-dev] RFR: 8306996: Open source Swing MenuItem related tests

[Victor Rudometov]

Backport of https://github.com/openjdk/jdk/commit/73491fa452e73cf7c02c577f4e3f1a34c02bea6d 
https://bugs.openjdk.org/browse/JDK-8306996: Open source Swing MenuItem related tests

Clean backport, new tests, low risk
Tested on macOS x64, linux x64

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Commit messages:
 - 8306996: Open source Swing MenuItem related tests

Changes: https://git.openjdk.org/jdk17u-dev/pull/1347/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1347&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306996
  Stats: 459 lines in 4 files changed: 459 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1347.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1347/head:pull/1347

PR: https://git.openjdk.org/jdk17u-dev/pull/1347