RFR: 8316285: Opensource JButton manual tests

[Tejesh R]

On Wed, 20 Sep 2023 05:29:30 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

> Few closed JButton swing manual test converted to automated and open sourced.

test/jdk/javax/swing/JButton/bug4234034.java line 41:

> 39:     static JFrame frame;
> 40:     static JButton button;
> 41:     static Robot robot;

Can remove `static Robot` since local is created. (Applicable to other test)

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PR Review Comment: https://git.openjdk.org/jdk/pull/15835#discussion_r1331030643