j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/newClassExpression/newInnerClass.kt

@@ -0,0 +1,12 @@
+package org.test
+
+class OuterClass {
+    inner class InnerClass
+}
+
+class User {
+    fun main() {
+        val outerObject = OuterClass()
+        val innerObject = outerObject.InnerClass()
+    }
+}