RFR: 8305943: Open source few AWT Focus related tests

[Prasanta Sadhukhan]

This opensources few AWT Focus related tests.
CI runs are ok.

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Commit messages:
 - 8305943: Open source few AWT Focus related tests

Changes: https://git.openjdk.org/jdk/pull/13525/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13525&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305943
  Stats: 765 lines in 5 files changed: 765 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13525.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13525/head:pull/13525

PR: https://git.openjdk.org/jdk/pull/13525