RFR: 8306134: Open source some AWT tests relating to Button and a few other classes

[Phil Race]

This open sources a few simple AWT jtreg tests that are overdue to be opened.

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Commit messages:
 - 8306134

Changes: https://git.openjdk.org/jdk/pull/13520/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13520&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306134
  Stats: 739 lines in 6 files changed: 739 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13520.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13520/head:pull/13520

PR: https://git.openjdk.org/jdk/pull/13520