Remove org.eclipse.test.source from o.e.test feature

Author: HannesWell

eclipse.platform.releng/features/org.eclipse.test-feature/feature.xml

@@ -31,10 +31,6 @@
          id="org.eclipse.test"
          version="0.0.0"/>
 
-   <plugin
-         id="org.eclipse.test.source"
-         version="0.0.0"/>
-
    <plugin
          id="org.eclipse.test.performance"
          version="0.0.0"/>