Can't right-click add project reference to Samples projects

### Describe the bug

Was trying to add another components (headered controls) as a project reference to the samples of another project (behaviors.samples) so that I could use the control within the samples for other examples in the Toolkit.

However, in VS, trying to use the UI causes a 'Missing value for TargetPlatformWinMDLocation property' error to appear. Not sure if we're missing this property and need to do something to 'trick' VS, or if we need to report this to VS?

### Steps to reproduce

```text
1) Open Behaviors component solution
2) Right-click on Behaviors.Samples project
3) Add -> Project Reference
4) See Error
```

### Expected behavior

Able to add reference to project via VS UI

### Screenshots


### 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

_No response_

### Help us help you

No, I'm unable to contribute a solution.

Öffne die Lösung der Behaviors-Komponente in Visual Studio und reproduziere den Fehler, indem du über die UI einen Projektverweis auf Behaviors.Samples hinzufügst. Untersuche die fehlende Eigenschaft TargetPlatformWinMDLocation; fertig ist die Aufgabe, wenn der Verweis über die Visual-Studio-UI ohne den Fehler hinzugefügt werden kann.

Vom Indexierungsmodell aus dem Issue-Text verfasst.