[wpilib] Propagate PWMMotorController stopMotor() and disable() to followers (#6750)

wpilibj/src/main/java/edu/wpi/first/wpilibj/motorcontrol/PWMMotorController.java

@@ -88,12 +88,20 @@ public abstract class PWMMotorController extends MotorSafety
   @Override
   public void disable() {
     m_pwm.setDisabled();
+
+    for (var follower : m_followers) {
+      follower.disable();
+    }
   }
 
   @Override
   public void stopMotor() {
     // Don't use set(0) as that will feed the watch kitty
     m_pwm.setSpeed(0);
+
+    for (var follower : m_followers) {
+      follower.stopMotor();
+    }
   }
 
   @Override