Ignore all launcher3 flaky test so that they come back online

Test dashboard: https://android-build.googleplex.com/builds/tests/search?filter=mediumFailureRate&filter=highFailureRate&query=config%3Av2%2Fgnl-eng%2Funbundled%2Flauncher%2Flauncher3_test_platform+latest%3A4d&tab=tests

Test: dashboard should not show flaky tests
Bug: 256832045
Change-Id: I06e879dec2703455b7be728c7afd3500d2edd54a

tests/src/com/android/launcher3/ui/widget/AddConfigWidgetTest.java

@@ -37,6 +37,7 @@ import com.android.launcher3.util.rule.ShellCommandRule;
 import com.android.launcher3.widget.LauncherAppWidgetProviderInfo;
 
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -64,6 +65,7 @@ public class AddConfigWidgetTest extends AbstractLauncherUiTest {
         mAppWidgetManager = AppWidgetManager.getInstance(mTargetContext);
     }
 
+    @Ignore
     @Test
     @PortraitLandscape
     public void testWidgetConfig() throws Throwable {