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

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

wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/Command.java

@@ -40,7 +40,6 @@ import edu.wpi.first.wpilibj.smartdashboard.SendableRegistry;
  * @see CommandGroup
  * @see IllegalUseOfCommandException
  */
-@SuppressWarnings("PMD.TooManyMethods")
 public abstract class Command implements Sendable, AutoCloseable {
   /**
    * The time since this command was initialized.

wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/CommandGroup.java

@@ -1,5 +1,5 @@
 /*----------------------------------------------------------------------------*/
-/* Copyright (c) 2008-2019 FIRST. All Rights Reserved.                        */
+/* Copyright (c) 2008-2020 FIRST. All Rights Reserved.                        */
 /* Open Source Software - may be modified and shared by FRC teams. The code   */
 /* must be accompanied by the FIRST BSD license file in the root directory of */
 /* the project.                                                               */
@@ -31,7 +31,6 @@ import static java.util.Objects.requireNonNull;
  * @see Subsystem
  * @see IllegalUseOfCommandException
  */
-@SuppressWarnings("PMD.TooManyMethods")
 public class CommandGroup extends Command {
   /**
    * The commands in this group (stored in entries).

wpilibOldCommands/src/main/java/edu/wpi/first/wpilibj/command/Scheduler.java

@@ -33,7 +33,6 @@ import edu.wpi.first.wpilibj.smartdashboard.SendableRegistry;
  *
  * @see Command
  */
-@SuppressWarnings("PMD.TooManyMethods")
 public final class Scheduler implements Sendable, AutoCloseable {
   /**
    * The Singleton Instance.