[jdk21u-dev] RFR: 8341311: [Accessibility, macOS, VoiceOver] VoiceOver announces incorrect number of items in submenu of JPopupMenu

[Satyen Subramaniam]

Backporting JDK-8341311: [Accessibility,macOS,VoiceOver] VoiceOver announces incorrect number of items in submenu of JPopupMenu. Patch ensures correct child details are sent back to a11y sub-system to be correct when using voice over and adds test. Backporting for parity with oracle. Ran GHA Sanity Checks, local Tier 1 and 2, and adjusted test directly. Patch is clean.

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Commit messages:
 - Backport e33eeeea04fc7899bf66b0a2fdaccc30060854b4

Changes: https://git.openjdk.org/jdk21u-dev/pull/2017/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2017&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341311
  Stats: 172 lines in 3 files changed: 170 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2017.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2017/head:pull/2017

PR: https://git.openjdk.org/jdk21u-dev/pull/2017