RFR: 8306484: Open source several AWT Choice jtreg tests

[Phil Race]

Open sourcing several AWT Choice regression tests

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Commit messages:
 - 8306484

Changes: https://git.openjdk.org/jdk/pull/13620/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13620&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306484
  Stats: 1048 lines in 6 files changed: 1048 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13620.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13620/head:pull/13620

PR: https://git.openjdk.org/jdk/pull/13620