RFR: 8305942: Open source several AWT Focus related tests [v2]

[Prasanta Sadhukhan]

> This opensources several other AWT Focus related tests.
> CI runs are ok.

Prasanta Sadhukhan has updated the pull request incrementally with two additional commits since the last revision:

 - Remove start comment
 - Made test to run on all headful platforms

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13527/files
  - new: https://git.openjdk.org/jdk/pull/13527/files/1a76dbae..29ad21bb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13527&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13527&range=00-01

  Stats: 12 lines in 1 file changed: 1 ins; 9 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13527.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13527/head:pull/13527

PR: https://git.openjdk.org/jdk/pull/13527