[jdk21u-dev] RFR: 8328158: Convert java/awt/Choice/NonFocusablePopupMenuTest to automatic main test

[Andrew Lu]

I backport this for parity with 21.0.5-oracle.

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Commit messages:
 - Backport b8dfeafdfd9ca024c92c9a73b59e6e71c0551985

Changes: https://git.openjdk.org/jdk21u-dev/pull/810/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=810&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328158
  Stats: 352 lines in 3 files changed: 95 ins; 257 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/810.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/810/head:pull/810

PR: https://git.openjdk.org/jdk21u-dev/pull/810