RFR: 8340874: Open source some of the AWT Geometry/Button tests

[Jayathirth D V]

Cleanup and open source some of the AWT geom and button tests.

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Commit messages:
 - 8340874: Open source some of the AWT Geometry/Button tests

Changes: https://git.openjdk.org/jdk/pull/21246/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21246&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340874
  Stats: 438 lines in 4 files changed: 438 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21246.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21246/head:pull/21246

PR: https://git.openjdk.org/jdk/pull/21246