RFR: 8306137: Open source several AWT ScrollPane related tests [v7]

[Tejesh R]

On Tue, 16 May 2023 14:02:47 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> Functionally doesn't matter, I guess its for grouping similar functionalities into particular methods.
>
> Yes, I agree it's better to combine them but then you could go further and remove `start()` and `init()` altogether.
> 
> It would be good to be consistent across test groups especially those handled by one person. Yet I admit I didn't pay much attention to this thing.

I have updated all the test for consistency.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13621#discussion_r1195232259