RFR: 8328158: Convert java/awt/Choice/NonFocusablePopupMenuTest to automatic main test [v4]

[Alexander Zuev]

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

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Minor updates

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18300/files
  - new: https://git.openjdk.org/jdk/pull/18300/files/17b1fb4d..71885dd6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18300&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18300&range=02-03

  Stats: 6 lines in 1 file changed: 1 ins; 4 del; 1 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