TF-2528 Add integration test for search email with sort by sender nam…e ascending

integration_test/base/core_robot.dart

@@ -1,4 +1,3 @@
-import 'package:flutter_test/flutter_test.dart';
 import 'package:patrol/patrol.dart';
 
 abstract class CoreRobot {
@@ -6,10 +5,5 @@ abstract class CoreRobot {
 
   CoreRobot(this.$);
 
-  Future<void> ensureViewVisible(PatrolFinder patrolFinder) async {
-    await $.waitUntilVisible(patrolFinder);
-    expect(patrolFinder, findsWidgets);
-  }
-
   dynamic ignoreException() => $.tester.takeException();
 }