Ignore app.stop events received before the app.detach response in att…

…ach integration tests (#128593)

The app.detach command will close the VM service connection, which yields an app.stop event in the daemon protocol.  The daemon does not guarantee any ordering between this event and the response to the app.detach.

See flutter/flutter#128546

packages/flutter_tools/test/integration.shard/test_driver.dart

@@ -757,7 +757,7 @@ class FlutterRunTestDriver extends FlutterTestDriver {
     // to throw if it sees an app.stop event before the response to this request.
     final Future<Map<String, Object?>> responseFuture = _waitFor(
       id: requestId,
-      ignoreAppStopEvent: method == 'app.stop',
+      ignoreAppStopEvent: method == 'app.stop' || method == 'app.detach',
     );
     _process?.stdin.writeln(jsonEncoded);
     final Map<String, Object?> response = await responseFuture;