Unstable ScrollToPosition.End on Windows

### Description

`ScrollToPosition.End` is unstable on Windows as shown in the video below.

https://github.com/user-attachments/assets/7b8cc651-f1ab-4191-888c-72e05f9fc517

**It works well on Android. It has not been tested on iOS.**

### Steps to Reproduce

- Create a new project with Visual Studio 2026 with Maui Workload installed.

- Add `SimplePage.xaml.cs`:
```cs
public partial class SimplePage : ContentPage
{
private readonly ObservableCollection _data = [];
public SimplePage()
{
InitializeComponent();
cv.ItemsSource = _data;
}
private async void Initialize_Clicked(object sender, EventArgs e)
{
_data.Clear();
foreach (var item in Enumerable.Range(0, 50).Select(i => $" Item {i}"))
{
await Task.Delay(250);
_data.Add(item);
cv.ScrollTo(item, position: ScrollToPosition.End);
}
}
}
```
- Add `SimplePage.xaml`:
```xml

```

### Link to public reproduction project repository

It is too simple to reproduce so no repo is provided.

### Version with bug

10.0.11

### Is this a regression from previous behavior?

Not sure, did not test other versions

### Last version that worked well

Unknown/Other

### Affected platforms

Windows

### Affected platform versions

Windows 10 Build 19045.6466

### Did you find any workaround?

_No response_

### Relevant log output

```shell

```

Start with the SimplePage.xaml.cs reproduction and its CollectionView usage, then run the sample on Windows 10 with MAUI 10.0.11. Compare the repeated ScrollTo calls using ScrollToPosition.End with the stated Android behavior. Done means the same incremental initialization reliably scrolls to the end on Windows.

Written by the indexing model from the issue text.