RFR: 8341162: Open source some of the AWT window test [v4]

[Alexey Ivanov]

On Fri, 4 Oct 2024 17:16:26 GMT, Jayathirth D V <jdv at openjdk.org> wrote:

>> Clean up and open source some of the AWT window tests.
>> Automated test `OwnedWindowShowTest.java` is verified in our CI also and it passes on all platforms.
>
> Jayathirth D V has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update for review comments

Marked as reviewed by aivanov (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21284#pullrequestreview-2348638614