[jdk21u-dev] RFR: 8340432: Open source some MenuBar tests - Set2

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

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Commit messages:
 - Backport 013250e4a7bc2fa83c6e57bb8fad6002dbe3176c

Changes: https://git.openjdk.org/jdk21u-dev/pull/1609/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1609&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340432
  Stats: 325 lines in 4 files changed: 325 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1609.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1609/head:pull/1609

PR: https://git.openjdk.org/jdk21u-dev/pull/1609