RFR: Draft: 8274274: Update JavaFX test framework to JUnit 5 [v5]

[John Hendrikx]

On Sat, 25 Sep 2021 13:55:15 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> I've added JUnit 5 as a test dependency and made sure that the JUnit 4 tests still work.  Also added a single JUnit 5 tests, and confirmed it works.
>> 
>> I've updated the Eclipse project file for the base module only.
>
> John Hendrikx has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Readd junit declaration in allprojects and set junit version to 4.13.2

The thread on the mailinglist to gauge interest seems to have been concluded.  We got 4 responses, all in favor.

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PR: https://git.openjdk.java.net/jfx/pull/633