RFR: 8316285: Opensource JButton manual tests [v3]

[Prasanta Sadhukhan]

On Wed, 20 Sep 2023 09:47:36 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> Few closed JButton swing manual test converted to automated and open sourced.
>
> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comment update

Marked as reviewed by psadhukhan (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15835#pullrequestreview-1635271933