RFR: 8353655: Clean up and open source KeyEvent related tests (Part 1) [v3]

[Alexander Zuev]

> Clean up and open source three tests related to the KeyEvent mechanics.

Alexander Zuev has updated the pull request incrementally with two additional commits since the last revision:

 - Update test/jdk/java/awt/event/KeyEvent/HomeEndKeyTest.java
   
   Co-authored-by: Andrey Turbanov <turbanoff at gmail.com>
 - Add i18n key

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/24609/files
  - new: https://git.openjdk.org/jdk/pull/24609/files/b8761634..8e0c9e98

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24609&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24609&range=01-02

  Stats: 2 lines in 2 files changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/24609.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24609/head:pull/24609

PR: https://git.openjdk.org/jdk/pull/24609