RFR: 8353748: Open source several swing tests batch6 [v3]

[Alexander Zuev]

On Fri, 18 Apr 2025 17:14:28 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> Open-sourcing and standardizing several swing tests (JTree)
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove headful tags. Change errors to RE.

Looks good

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Marked as reviewed by kizune (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24730#pullrequestreview-2779334083