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

[John Hendrikx]

> 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

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/633/files
  - new: https://git.openjdk.java.net/jfx/pull/633/files/df3fd2e3..7d56bcd0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=633&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=633&range=03-04

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/633.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/633/head:pull/633

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