Re-enable ClasspathListenerHandlerText.sourceJar

So we can try to understand why it fails in CI builds.

headless-services/jdt-ls-extension/org.springframework.tooling.jdt.ls.commons.test/src/org/springframework/tooling/jdt/ls/commons/test/ClasspathListenerHandlerTest.java

@@ -153,7 +153,6 @@ public class ClasspathListenerHandlerTest {
 		});
 	}
 
-	@Ignore //TODO: why is this failing in CI builds but passing locally?
 	@Test public void sourceJar() throws Exception {
 		String projectName = "maven-with-jar-dependency";
 		IProject project = createTestProject(projectName);