The RequestMessage in Constructor

### Describe the bug

If the RequestMessage is used in the constructor, the xaml design view will not be displayed correctly.

### Regression

_No response_

### Steps to reproduce

```text
class ViewModel : ObservableRecipient
{
public ViewModel()
{
var str = WeakReferenceMessenger.Default.Send>();
}
}
```

### Expected behavior

The design view is displayed normally

### Screenshots

_No response_

### IDE and version

VS 2022

### IDE version

17.4.4

### Nuget packages

- [ ] CommunityToolkit.Common
- [ ] CommunityToolkit.Diagnostics
- [ ] CommunityToolkit.HighPerformance
- [X] CommunityToolkit.Mvvm (aka MVVM Toolkit)

### Nuget package version(s)

8.1.0

### Additional context

_No response_

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