Update Angular embedding sample (#2147)

- Replace `package:js` usage with `dart:js_interop`
- Remove and ignore `package-lock.json` since it keeps causing security
warnings: https://github.com/flutter/samples/security/dependabot. It's
not necessary for this sample and the constraints already present in the
`package.json`.
- Update to Angular 17.1

web_embedding/ng-flutter/flutter/lib/src/js_interop.dart

@@ -1,7 +1,8 @@
 /// Exposes useful functions to interop with JS from our Flutter app.
-library example_js_interop;
+library;
 
 export 'js_interop/counter_state_manager.dart';
 export 'js_interop/helper.dart' show broadcastAppEvent;
 
-export 'package:js/js_util.dart' show createDartExport;
+// Replace with createJSInteropWrapper when updating to Dart 3.3.
+export 'dart:js_util' show createDartExport;

web_embedding/ng-flutter/flutter/lib/src/js_interop/counter_state_manager.dart

@@ -1,5 +1,6 @@
+import 'dart:js_interop';
+
 import 'package:flutter/foundation.dart';
-import 'package:js/js.dart';
 
 enum DemoScreen {
   counter('counter'),

web_embedding/ng-flutter/flutter/lib/src/js_interop/dom.dart

@@ -1,9 +1,8 @@
-import 'dart:js_interop';
-import 'package:js/js.dart';
-import 'package:js/js_util.dart' as js_util;
-
 /// This is a little bit of JS-interop code so this Flutter app can dispatch
 /// a custom JS event (to be deprecated by package:web)
+library;
+
+import 'dart:js_interop';
 
 @JS('CustomEvent')
 @staticInterop
@@ -12,8 +11,7 @@ class DomCustomEvent {
   external factory DomCustomEvent.withOptions(JSString type, JSAny options);
   factory DomCustomEvent._(String type, [Object? options]) {
     if (options != null) {
-      return DomCustomEvent.withOptions(
-          type.toJS, js_util.jsify(options) as JSAny);
+      return DomCustomEvent.withOptions(type.toJS, options.jsify()!);
     }
     return DomCustomEvent.withType(type.toJS);
   }

web_embedding/ng-flutter/flutter/pubspec.yaml

@@ -7,10 +7,8 @@ environment:
   sdk: ^3.2.0
 
 dependencies:
-  cupertino_icons: ^1.0.2
   flutter:
     sdk: flutter
-  js: ^0.7.0
 
 dev_dependencies:
   flutter_test: