CarouselView Renders Duplicate Data Templates Multiple Times

### Description

When running the Maui Samples, the `CarouselView` renders `Monkey` instances multiple times. In `MonkeysViewModel.CreateMoneyCollection` the code is loading 17 `Monkey` objects into `Monkeys`, an `ObservableCollection` of `Monkey`. However, the `CarouselView` is showing many more items than 17, duplicating the original 17 multiple times. Here's the URL to the solution in the `maui-samples` repository:

https://github.com/dotnet/maui-samples/tree/main/6.0/UserInterface/Views/CarouselViewDemos

I ran into this problem with my code and verified that it reproduces with the `maui-samples` solution too.

### Steps to Reproduce

1. Clone `maui-samples`
2. Run the carousel demo at https://github.com/dotnet/maui-samples/tree/main/6.0/UserInterface/Views/CarouselViewDemos
3. Select Horizontal Data Template
4. Observe the duplicated templates.

### Link to public reproduction project repository

https://github.com/dotnet/maui-samples/tree/main/6.0/UserInterface/Views/CarouselViewDemos

### Version with bug

7.0 (current)

### Last version that worked well

Unknown/Other

### Affected platforms

Windows

### Affected platform versions

10.0.17763.0

### Did you find any workaround?

_No response_

### Relevant log output

_No response_

Start by running the linked maui-samples CarouselViewDemos project on Windows and selecting Horizontal Data Template. Inspect MonkeysViewModel.CreateMoneyCollection and the CarouselView data-template setup; done means the 17 Monkey objects render once rather than appearing duplicated.

Written by the indexing model from the issue text.