RFR: 8354695: Open source several swing tests batch7 [v7]

[Alexander Zuev]

On Tue, 22 Apr 2025 19:04:23 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> Open-sourcing and standardizing several swing tests (JScrollPane & JRootPane)
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add dispose and setVisible to runTest

Marked as reviewed by kizune (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24758#pullrequestreview-2785222733