`StickyHeaderBehavior` in conjuction with `ListView.GroupStyle`: The `GroupStyle` header covers sticky header

### Describe the bug

Th in conjuction with `ObservableGroup`


### Steps to reproduce

Basically use the example xaml from the _MVVM Toolkit Sample App_, and add the `StickyHeaderBehavior` based on the example in _Windows Community Toolkit Gallery_:

```xaml

```

### Expected behavior

The ListView header should cover (higher z-index) than the GroupStyle header.

### Screenshots


### Code Platform

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

### Windows Build Number

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

### Other Windows Build number

23H2

### 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

2022

### Visual Studio Build Number

17.9.6

### Device form factor

Desktop

### Additional context

Not sure if this is more of a https://github.com/microsoft/microsoft-ui-xaml issue.

### Help us help you

No, I'm unable to contribute a solution.

Reproduce the issue using the MVVM Toolkit Sample App XAML and the StickyHeaderBehavior example from Windows Community Toolkit Gallery. Investigate the interaction between ListView.Header, ListView.GroupStyle, ItemsStackPanel sticky group headers, and SemanticZoom in WinAppSDK/WinUI 3. Done means the ListView header remains visually above the GroupStyle header without breaking grouped scrolling.

Written by the indexing model from the issue text.