j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/issues/kt-1048.java

@@ -0,0 +1,19 @@
+//file
+import java.util.HashMap;
+
+class G <T extends String> {
+  public <T> G(T t) {
+  }
+}
+
+public class Java {
+    void test() {
+        HashMap m = new HashMap();
+        m.put(1, 1);
+    }
+    void test2() {
+        HashMap<?, ?> m = new HashMap();
+        G g = new G("");
+        G<String> g2 = new G<String>("");
+    }
+}