[google_maps_flutter] Temporarily disable googleMapsPluginIsAdded (flutter#4214)

Currently has an out-of-band failure on master. Ignoring to re-open the
tree.

Author: stuartmorgan-g

packages/google_maps_flutter/google_maps_flutter/example/android/app/src/androidTest/java/io/flutter/plugins/googlemapsexample/GoogleMapsTest.java

@@ -8,9 +8,11 @@
 
 import androidx.test.core.app.ActivityScenario;
 import io.flutter.plugins.googlemaps.GoogleMapsPlugin;
+import org.junit.Ignore;
 import org.junit.Test;
 
 public class GoogleMapsTest {
+  @Ignore("Currently failing: https://github.com/flutter/flutter/issues/87566")
   @Test
   public void googleMapsPluginIsAdded() {
     final ActivityScenario<GoogleMapsTestActivity> scenario =