RFR: 8306409: Open source AWT KeyBoardFocusManger, LightWeightComponent related tests

[Abhishek Kumar]

This PR is to open source Keyboard Focus Manager, Light Weight Component and few other AWT tests.

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Commit messages:
 - Open source KFM, LWC and few other AWT tests

Changes: https://git.openjdk.org/jdk/pull/13633/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13633&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306409
  Stats: 611 lines in 6 files changed: 611 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13633.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13633/head:pull/13633

PR: https://git.openjdk.org/jdk/pull/13633