j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/literalExpression/dollarInsideString.java

@@ -0,0 +1,15 @@
+//file
+package demo;
+
+class Test {
+  void test() {
+    String name = "$$$$";
+    name = name.replaceAll("\\$[0-9]+", "\\$")
+
+    char c = '$';
+    System.out.println(c);
+
+    Character C = '$';
+    System.out.println(C);
+  }
+}