Remove Cart dependency from Android tests

Author: willpassidomo

android/src/test/java/com/mparticle/react/testutils/MockMParticleUser.java

@@ -5,7 +5,6 @@
 
 import com.mparticle.MParticle;
 import com.mparticle.UserAttributeListener;
-import com.mparticle.commerce.Cart;
 import com.mparticle.consent.ConsentState;
 import com.mparticle.identity.MParticleUser;
 
@@ -26,12 +25,6 @@ public long getId() {
         return mpid;
     }
 
-    @NonNull
-    @Override
-    public Cart getCart() {
-        return null;
-    }
-
     @NonNull
     @Override
     public Map<String, Object> getUserAttributes() {