CommunityToolkit.WinUI.UI.FrameworkElementExtensions.FindChild throw System.InvalidCastException with CollectionView

### Describe the bug

CommunityToolkit.WinUI.UI.FrameworkElementExtensions.FindChild throw System.InvalidCastException when a view contains CollectionView

### Steps to reproduce

```text
create a view with ListView
create CollectionView with CollectionView.Source = IEnumerable where T is interface;
ListView.ItemsSource bind to CollectionView.View
try to find any FrameworkElement on the view
```

### Expected behavior

FindChild must return found element or null if view doesn't contain it.

### Screenshots

_No response_

### Code Platform

- [ ] UWP
- [X] WinAppSDK / WinUI 3
- [ ] Web Assembly (WASM)
- [ ] Android
- [ ] iOS
- [ ] MacOS
- [ ] Linux / GTK

### Windows Build Number

- [X] Windows 10 1809 (Build 17763)
- [X] Windows 10 1903 (Build 18362)
- [X] Windows 10 1909 (Build 18363)
- [X] Windows 10 2004 (Build 19041)
- [X] Windows 10 20H2 (Build 19042)
- [X] Windows 10 21H1 (Build 19043)
- [X] Windows 10 21H2 (Build 19044)
- [X] Windows 10 22H2 (Build 19045)
- [X] Windows 11 21H2 (Build 22000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### App minimum and target SDK version

- [ ] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Windows 10, version 2104 (Build 20348)
- [X] Windows 11, version 22H2 (Build 22000)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

_No response_

### Visual Studio Build Number

_No response_

### Device form factor

_No response_

### Additional context

Test example
[CollectionViewTest](https://github.com/megamechanic/WinUIBugs)

### Help us help you

Yes, I'd like to be assigned to work on this item.
```[tasklist]
### Tasks
```

Comienza con CommunityToolkit.WinUI.UI.FrameworkElementExtensions.FindChild y reproduce el fallo usando el ejemplo CollectionViewTest enlazado. Prueba un ListView enlazado a un CollectionView cuya fuente sea IEnumerable con un tipo de elemento de interfaz. Se considera completado cuando FindChild devuelve el FrameworkElement correspondiente, o null cuando no está presente, sin lanzar InvalidCastException.

Escrito por el modelo de indexación a partir del texto del issue.