[build] Globally Exclude PMD.TooManyMethods (#2793)

This was not a useful check, as every time we hit it, we simply excluded it.

wpimath/src/generate/Nat.java.in

@@ -17,7 +17,7 @@ package edu.wpi.first.wpiutil.math;
  *
  * @param <T> The {@link Num} this represents.
  */
-@SuppressWarnings({"MethodName", "unused", "PMD.TooManyMethods"})
+@SuppressWarnings({"MethodName", "unused"})
 public interface Nat<T extends Num> {
   /**
    * The number this interface represents.