RFR: 8328158: Convert java/awt/Choice/NonFocusablePopupMenuTest to automatic main test

[Alexander Zuev]

Convert test to the automatic main and move it from its own folder since it is no longer required.

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Commit messages:
 - 8328158: Convert java/awt/Choice/NonFocusablePopupMenuTest to automatic main test

Changes: https://git.openjdk.org/jdk/pull/18300/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18300&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328158
  Stats: 351 lines in 3 files changed: 94 ins; 257 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18300.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18300/head:pull/18300

PR: https://git.openjdk.org/jdk/pull/18300