RFR: Draft: 8274274: Update JavaFX test framework to JUnit 5 [v4]

[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:

  Upgrade to JUnit 4.13.2

-------------

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/633/files
  - new: https://git.openjdk.java.net/jfx/pull/633/files/d0d7969e..df3fd2e3

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=633&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=633&range=02-03

  Stats: 15 lines in 2 files changed: 13 ins; 2 del; 0 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