XAML-Knight

Results 4 issues of XAML-Knight

## Fixes #4440 Need to remove references to detached code, as they appear in the Community Toolkit Sample App as empty placeholders. ## PR Type What kind of change does...

bug :bug:

## Describe the bug The text in the OK & Cancel buttons of the `InAppNotification `control are cut when setting the text scale to 225% from Windows settings: ![image](https://user-images.githubusercontent.com/86266896/133513992-0b188b5f-424d-47e4-b2db-38af659b38b3.png) ......

bug :bug:
controls :control_knobs:
accessibility :wheelchair:

## Fixes #3555 The ThemeListener Sample Page uses it's own ThemeListener, when in reality it could just use the Sample App's Sample Controller ThemeListener instance, instead. This PR also includes...

documentation :page_with_curl:
sample app 🖼
sample bug :bug:

### Describe the bug The WCT samples.json file contains references to code packages that have already been detached: - Guard APIs - High Performance APIs - MVVM Toolkit ### Regression...

bug :bug:
In-PR :rocket: