Refactor tests and activate them for working with JS

idea/testData/completion/basic/java/TopLevelFromStandardLibraryWithoutParam.kt

@@ -0,0 +1,10 @@
+package testing
+
+fun someFun() {
+  defaultDocumentBuilderFa<caret>
+}
+
+// Important: This test checks that completion will find top level functions from jars.
+// If you going to update it make sure that methods are not auto-imported
+
+// EXIST: defaultDocumentBuilderFactory