RFR: 8339170: ☂ Convert tests to JUnit 5

Fri Apr 11 21:09:35 UTC 2025

On Fri, 11 Apr 2025 21:01:13 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> For this specific case, this PR may be premature.

To be more precise, it's the changes in `build.gradle` I'm concerned about. The rest looks like good cleanup (although will need review and testing).

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PR Comment: https://git.openjdk.org/jfx/pull/1774#issuecomment-2798012529