[jdk21u-dev] RFR: 8315761: Open source few swing JList and JMenuBar tests

[Andrew Lu]

I backport this for parity with 21.0.3-oracle.

-------------

Commit messages:
 - Backport bb6b3f2486b07a6ccdeea18519453e6d9c05c2c3

Changes: https://git.openjdk.org/jdk21u-dev/pull/219/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=219&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315761
  Stats: 249 lines in 4 files changed: 249 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/219.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/219/head:pull/219

PR: https://git.openjdk.org/jdk21u-dev/pull/219