j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/tryWithResource/Simple.java

@@ -0,0 +1,10 @@
+//file
+import java.io.*;
+
+public class C {
+    void foo() throws IOException {
+        try(InputStream stream = new ByteArrayInputStream(new byte[10])) {
+            System.out.println(stream.read());
+        }
+    }
+}