There was a funny mix of JUnit 4 & 5 annotations used by
org.eclipse.pde.ds.annotations.tests. Tests were not built and not
executed at all.

- *build* org.eclipse.pde.ds.annotations.tests with maven build
- *run* org.eclipse.pde.ds.annotations.tests with Jenkins
- Most of tests are currently failing, so disabled failing :-(

Fixes https://github.com/eclipse-pde/eclipse.pde/issues/2079