[Android] Increase timeout duration for spell check integration test (flutter#117989)

* Add timeout

* Add library directive

* Add comment, remove testing only changes

Author: camsim99

dev/integration_tests/spell_check/integration_test/integration_test.dart

@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// TODO(camsim99): Revert this timeout change after effects are investigated.
+@Timeout(Duration(seconds: 60))
+library;
+
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/services.dart';