Remove android_verified_input, it was never added to CI and does not run locally. (#162895)

Someone could always resurrect it via `git`-magic (or GitHub), but let's
not maintain (including Gradle lock files, Dart analysis, etc) unused
code that hasn't run in 12+ months.

/cc @johnmccutchan

dev/devicelab/bin/tasks/android_verified_input_test.dart

@@ -1,10 +0,0 @@
-// 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/framework/framework.dart';
-import 'package:flutter_devicelab/tasks/android_verified_input_test.dart';
-
-Future<void> main() async {
-  await task(androidVerifiedInputTest());
-}

dev/devicelab/lib/tasks/android_verified_input_test.dart

@@ -1,59 +0,0 @@
-// 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 '../framework/devices.dart';
-import '../framework/framework.dart';
-import '../framework/task_result.dart';
-import '../framework/utils.dart';
-
-TaskFunction androidVerifiedInputTest({Map<String, String>? environment}) {
-  return DriverTest(
-    '${flutterDirectory.path}/dev/integration_tests/android_verified_input',
-    'test_driver/main_test.dart',
-    environment: environment,
-  ).call;
-}
-
-class DriverTest {
-  DriverTest(
-    this.testDirectory,
-    this.testTarget, {
-    this.extraOptions = const <String>[],
-    this.deviceIdOverride,
-    this.environment,
-  });
-
-  final String testDirectory;
-  final String testTarget;
-  final List<String> extraOptions;
-  final String? deviceIdOverride;
-  final Map<String, String>? environment;
-
-  Future<TaskResult> call() {
-    return inDirectory<TaskResult>(testDirectory, () async {
-      String deviceId;
-      if (deviceIdOverride != null) {
-        deviceId = deviceIdOverride!;
-      } else {
-        final Device device = await devices.workingDevice;
-        await device.unlock();
-        deviceId = device.deviceId;
-      }
-      await flutter('packages', options: <String>['get']);
-
-      final List<String> options = <String>[
-        '--no-android-gradle-daemon',
-        '-v',
-        '-t',
-        testTarget,
-        '-d',
-        deviceId,
-        ...extraOptions,
-      ];
-      await flutter('drive', options: options, environment: environment);
-
-      return TaskResult.success(null);
-    });
-  }
-}