RFR: 8306489: Open source AWT List related tests

[Abhishek Kumar]

This PR is to open source List related AWT tests.

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Commit messages:
 - Few more tests open sourced
 - Open source List AWT tests

Changes: https://git.openjdk.org/jdk/pull/13748/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13748&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306489
  Stats: 819 lines in 7 files changed: 819 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13748.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13748/head:pull/13748

PR: https://git.openjdk.org/jdk/pull/13748