[jdk23u] RFR: 8340007: Refactor KeyEvent/FunctionKeyTest.java

[Alexey Ivanov]

Backporting [JDK-8340007](https://bugs.openjdk.org/browse/JDK-8340007) to 23u.

> This pull request contains a backport of commit [2faf8b8d](https://github.com/openjdk/jdk/commit/2faf8b8d582183275b1fdc92313a1c63c1753e80) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
>
> The commit being backported was authored by Alexey Ivanov on 19 Sep 2024 and was reviewed by Alexander Zvegintsev.

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Commit messages:
 - Backport 2faf8b8d582183275b1fdc92313a1c63c1753e80

Changes: https://git.openjdk.org/jdk23u/pull/105/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=105&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340007
  Stats: 114 lines in 1 file changed: 62 ins; 15 del; 37 mod
  Patch: https://git.openjdk.org/jdk23u/pull/105.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/105/head:pull/105

PR: https://git.openjdk.org/jdk23u/pull/105