[jdk21u-dev] RFR: 8340417: Open source some MenuBar tests - Set1

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

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Commit messages:
 - Backport 559289487d97230760cff6f3349be4dc55c3a2ef

Changes: https://git.openjdk.org/jdk21u-dev/pull/1631/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1631&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340417
  Stats: 407 lines in 4 files changed: 407 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1631.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1631/head:pull/1631

PR: https://git.openjdk.org/jdk21u-dev/pull/1631