Reverts "Reland Add platform view wide gamut test" (#139189)

Reverts flutter/flutter#139101
Initiated by: jonahwilliams
This change reverts the following previous change:
Original Description:
Reland of https://github.com/flutter/flutter/pull/138837

I reverted too many config files, the app needed the pbx project file in order to find the new class I added. Instead, just put the new platform view in the app delegate so it builds.

dev/integration_tests/wide_gamut_test/integration_test/app_test.dart

@@ -166,15 +166,6 @@ void main() {
       app.run(app.Setup.drawnImage);
       await tester.pumpAndSettle(const Duration(seconds: 2));
 
-      const MethodChannel channel = MethodChannel('flutter/screenshot');
-      final List<Object?> result =
-          await channel.invokeMethod('test') as List<Object?>;
-      expect(_findColor(result, <double>[0.0, 1.0, 0.0]), isTrue);
-    });
-    testWidgets('draw image with wide gamut works ontop of platform view with blur', (WidgetTester tester) async {
-      app.run(app.Setup.drawnImageAndPlatformView);
-      await tester.pumpAndSettle(const Duration(seconds: 2));
-
       const MethodChannel channel = MethodChannel('flutter/screenshot');
       final List<Object?> result =
           await channel.invokeMethod('test') as List<Object?>;

dev/integration_tests/wide_gamut_test/ios/Runner/AppDelegate.swift

-// 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 Foundation
-import UIKit
-import Flutter
-
-class FLNativeViewFactory: NSObject, FlutterPlatformViewFactory {
-    private var messenger: FlutterBinaryMessenger
-
-    init(messenger: FlutterBinaryMessenger) {
-        self.messenger = messenger
-        super.init()
-    }
-
-    func create(
-        withFrame frame: CGRect,
-        viewIdentifier viewId: Int64,
-        arguments args: Any?
-    ) -> FlutterPlatformView {
-        return FLNativeView(
-            frame: frame,
-            viewIdentifier: viewId,
-            arguments: args,
-            binaryMessenger: messenger)
-    }
-
-    public func createArgsCodec() -> FlutterMessageCodec & NSObjectProtocol {
-          return FlutterStandardMessageCodec.sharedInstance()
-    }
-}
-
-class SolidColorView: UIView {
-  override init(frame: CGRect) {
-    super.init(frame: frame)
-    setupView()
-  }
-
-  required init?(coder aDecoder: NSCoder) {
-    super.init(coder: aDecoder)
-    setupView()
-  }
-
-  private func setupView() {
-    backgroundColor = .blue
-  }
-}
-
-
-class FLNativeView: NSObject, FlutterPlatformView {
-    private var childView: UIView
-
-    init(
-        frame: CGRect,
-        viewIdentifier viewId: Int64,
-        arguments args: Any?,
-        binaryMessenger messenger: FlutterBinaryMessenger?
-    ) {
-        childView = SolidColorView()
-        super.init()
-    }
-
-    func view() -> UIView {
-        return childView
-    }
-}
-
-@UIApplicationMain
-@objc class AppDelegate: FlutterAppDelegate {
-  override func application(
-    _ application: UIApplication,
-    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
-  ) -> Bool {
-    GeneratedPluginRegistrant.register(with: self)
-
-    var registrar = self.registrar(forPlugin: "plugin-name")
-
-    let factory = FLNativeViewFactory(messenger: registrar!.messenger())
-    self.registrar(forPlugin: "<plugin-name>")!.register(
-        factory,
-        withId: "<dummy-view>")
-
-    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
-  }
-}

dev/integration_tests/wide_gamut_test/lib/main.dart

@@ -145,7 +145,6 @@ enum Setup {
   canvasSaveLayer,
   blur,
   drawnImage,
-  drawnImageAndPlatformView
 }
 
 void run(Setup setup) {
@@ -245,19 +244,6 @@ Future<ui.Image> _loadImage() async {
   return (await codec.getNextFrame()).image;
 }
 
-class DummyPlatformView extends StatelessWidget {
-  const DummyPlatformView({super.key});
-
-  @override
-  Widget build(BuildContext context) {
-    return const SizedBox(
-      width: 400,
-      height: 400,
-      child: UiKitView(viewType: '<dummy-view>'),
-    );
-  }
-}
-
 class MyHomePage extends StatefulWidget {
   const MyHomePage(this.setup, {super.key, required this.title});
 
@@ -299,14 +285,6 @@ class _MyHomePageState extends State<MyHomePage> {
         imageWidget = Image.memory(base64Decode(_displayP3Logo));
       case Setup.drawnImage:
         imageWidget = CustomPaint(painter: _SaveLayerDrawer(_image));
-      case Setup.drawnImageAndPlatformView:
-        imageWidget = Stack(
-          children: <Widget>[
-            const DummyPlatformView(),
-            Image.memory(base64Decode(_displayP3Logo)),
-            BackdropFilter(filter: ui.ImageFilter.blur(sigmaX: 6, sigmaY: 6), child: const SizedBox(width: 400, height: 400)),
-          ],
-        );
       case Setup.canvasSaveLayer:
         imageWidget = CustomPaint(painter: _SaveLayerDrawer(_image));
       case Setup.blur: