j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/staticMembers/PrivateStaticMethods3.kt

@@ -0,0 +1,20 @@
+class A {
+    public class Nested {
+        fun foo() {
+            privateStatic1()
+        }
+    }
+
+    fun bar() {
+        privateStatic2()
+    }
+
+    class object {
+
+        private fun privateStatic1() {
+        }
+
+        private fun privateStatic2() {
+        }
+    }
+}