RFR: 8354653: Clean up and open source KeyEvent related tests (Part 4)

[Alexander Zuev]

Clean up four more KeyEvent related tests.

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Commit messages:
 - 8354653: Clean up and open source KeyEvent related tests (Part 4)

Changes: https://git.openjdk.org/jdk/pull/24763/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24763&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354653
  Stats: 409 lines in 4 files changed: 409 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24763.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24763/head:pull/24763

PR: https://git.openjdk.org/jdk/pull/24763