bug: Angular - Argument of type 'Event' is not assignable to parameter of type 'CustomEvent<XXX>'.

### Prerequisites

- [X] I have read the [Contributing Guidelines](https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#creating-an-issue).
- [X] I agree to follow the [Code of Conduct](https://ionicframework.com/code-of-conduct).
- [X] I have searched for [existing issues](https://github.com/ionic-team/ionic-framework/issues) that already report this problem, without success.

### Ionic Framework Version

- [ ] v4.x
- [X] v5.x
- [X] v6.x

### Current Behavior

Wrong definition type breaks the app.

### Expected Behavior

Having the right definition type

### Steps to Reproduce

- Create a new ionic project: `ionic start test-ionic`
- Framework: Angular
- Starter template: tabs

Copy/paste the code sample (html and ts) from https://ionicframework.com/docs/api/reorder-group in `tab1.page.(html|ts)`. Then in your IDE you'll notice the given error:

> Argument of type 'Event' is not assignable to parameter of type 'CustomEvent'. Type 'Event' is missing the following properties from type 'CustomEvent': detail, initCustomEventngtsc(2345)

Try to build the app: `ionic build --prod`, it won't build (same error).

It does this with other events as well...

Same issue occurs on ionic 6 rc3

### Code Reproduction URL

https://github.com/JumBay/ionic-event-type-issue

### Ionic Info

$ ionic info
[WARN] Error loading @capacitor/ios package.json: Error: Cannot find module '@capacitor/ios/package'

Require stack:
- /usr/local/lib/node_modules/@ionic/cli/lib/project/index.js
- /usr/local/lib/node_modules/@ionic/cli/lib/index.js
- /usr/local/lib/node_modules/@ionic/cli/index.js
- /usr/local/lib/node_modules/@ionic/cli/bin/ionic
[WARN] Error loading @capacitor/android package.json: Error: Cannot find module '@capacitor/android/package'

Require stack:
- /usr/local/lib/node_modules/@ionic/cli/lib/project/index.js
- /usr/local/lib/node_modules/@ionic/cli/lib/index.js
- /usr/local/lib/node_modules/@ionic/cli/index.js
- /usr/local/lib/node_modules/@ionic/cli/bin/ionic

Ionic:

Ionic CLI : 6.18.1 (/usr/local/lib/node_modules/@ionic/cli)
Ionic Framework : @ionic/angular 5.9.1
@angular-devkit/build-angular : 12.1.4
@angular-devkit/schematics : 12.1.4
@angular/cli : 12.1.4
@ionic/angular-toolkit : 4.0.0

Capacitor:

Capacitor CLI : 3.3.2
@capacitor/android : not installed
@capacitor/core : 3.3.2
@capacitor/ios : not installed

Utility:

cordova-res : not installed globally
native-run : 1.5.0

System:

NodeJS : v14.18.1 (/usr/local/bin/node)
npm : 6.14.15
OS : macOS Monterey

### Additional Information

_No response_