j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/switch/enumConstants.kt

@@ -0,0 +1,12 @@
+enum class ColorEnum {
+    GREEN
+}
+
+class MyClass {
+    fun method(colorEnum: ColorEnum): Int {
+        when (colorEnum) {
+            ColorEnum.GREEN -> return 1
+            else -> return 2
+        }
+    }
+}