Add Firebase AdMob C++ integration test.

This also includes two fixes:
- sample_framework: when redirecting all of stdout to the onscreen textView, also redirect it to the device log. This allows you to see googletest output in adb logcat or in the Xcode device log.
- In AdMob C++ iOS, update presentation state when moving BannerViews, to be consistent with presentation state updates on Android.

PiperOrigin-RevId: 257025107

Author: jonsimantov

admob/src/ios/banner_view_internal_ios.mm

@@ -142,6 +142,7 @@
       [banner_view_ moveBannerViewToXCoordinate:x yCoordinate:y];
       error = kAdMobErrorNone;
       error_msg = nullptr;
+      NotifyListenerOfPresentationStateChange([banner_view_ presentationState]);
     }
     CompleteFuture(error, error_msg, handle, &future_data_);
   });
@@ -157,6 +158,7 @@
       [banner_view_ moveBannerViewToPosition:position];
       error = kAdMobErrorNone;
       error_msg = nullptr;
+      NotifyListenerOfPresentationStateChange([banner_view_ presentationState]);
     }
     CompleteFuture(error, error_msg, handle, &future_data_);
   });