Enable ScrollViewer Chaining in the Sample App?

### Describe the bug

See guidance on [scroll chaining here](https://learn.microsoft.com/en-us/windows/apps/design/input/guidelines-for-panning#:~:text=concept%20of%20rails.-,chaining%20embedded%20or%20nested%20content,-After%20a%20user)

Basically, we want to be able to continue to scroll down a page, and if a sample is using a scroll viewer to continue past that sample once it's finished scrolling as well.

Problem is this is probably not supported by the OS? 😟 See:

> Because mouse wheel rotations are handled as inertial manipulations, chaining does not work.

From: https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.controls.scrollviewer.isverticalscrollchainingenabled

Not clear if it'd be resolved by https://github.com/microsoft/microsoft-ui-xaml/issues/108

Also see https://github.com/microsoft/microsoft-ui-xaml/issues/7902

### Steps to reproduce

```text
1. Open Sample App
2. Look at a sample that involves scrolling (like the Header Behaviors from https://github.com/CommunityToolkit/Windows/pull/136)
3. Try scrolling down the page (i.e. with a mouse wheel)
4. You get halted at the bottom of any of the lists from scrolling.
```

### Expected behavior

Can continue to scroll.

### Screenshots

_No response_

### Code Platform

- [ ] UWP
- [ ] 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 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)
- [ ] 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

Maybe this is something we need to investigate a helper for for now?

Related to #74

### Help us help you

Yes, but only if others can assist.

Sample App から始め、マウスホイールを使って入れ子になった ScrollViewer の動作を再現します。リンクされている scroll-chaining のガイダンスと関連する issue #108、#7902、#74 を読み、OS が要求された動作をサポートしているか、または helper が実現可能かを判断します。完了条件は、文書化された解決策または合意された実装方針です。

索引モデルが issue の本文から書いたものです。