Add LongestValidParenthesesTest (#3612)

src/main/java/com/thealgorithms/dynamicprogramming/LongestValidParentheses.java

@@ -43,19 +43,4 @@ public class LongestValidParentheses {
 
         return max;
     }
-
-    public static void main(String[] args) {
-        Scanner sc = new Scanner(System.in);
-
-        while (true) {
-            String str = sc.nextLine();
-            if ("quit".equals(str)) {
-                break;
-            }
-
-            System.out.println("Len is: " + getLongestValidParentheses(str));
-        }
-
-        sc.close();
-    }
 }