Remove smoke_catalina_start_up_ios (#74007)

dev/devicelab/bin/tasks/smoke_catalina_start_up_ios.dart

-// Copyright 2014 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import 'package:flutter_devicelab/tasks/perf_tests.dart';
-import 'package:flutter_devicelab/framework/adb.dart';
-import 'package:flutter_devicelab/framework/framework.dart';
-
-Future<void> main() async {
-  deviceOperatingSystem = DeviceOperatingSystem.ios;
-  // It's intended to use the Gallery startup test as a smoke test on macOS
-  // Catalina.
-  await task(createFlutterGalleryStartupTest());
-}

dev/devicelab/manifest.yaml

@@ -494,12 +494,6 @@ tasks:
     stage: devicelab_ios
     required_agent_capabilities: ["mac/ios"]
 
-  smoke_catalina_start_up_ios:
-    description: >
-      A smoke test that runs on macOS Catalina, which is a clone of the Gallery startup latency test.
-    stage: devicelab_ios
-    required_agent_capabilities: ["mac-catalina/ios"]
-
   smoke_catalina_hot_mode_dev_cycle_ios__benchmark:
     description: >
       A some test that runs on macOS Catalina, which is a clone of the Dart VM hot patching performance benchmarking.