[Preview] .NET Aspire - Incorrect configuration when "Place project and solution in same folder" was used

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the bug

Visual Studio interprets the solution like this:


So the newly added files are both inside their new project, and the selected


### Expected Behavior

- Perhaps show an error message
- Or convert the project to a subfolder structure

### Steps To Reproduce

- Create new ASP.NET Core application
- Choose to put the project/solution in the same folder
- Add Aspire

### Exceptions (if any)


> CS0121
> The call is ambiguous between the following methods or properties:
> 'Microsoft.Extensions.Hosting.Extensions.AddServiceDefaults(Microsoft.Extensions.Hosting.IHostApplicationBuilder)' and
> 'Microsoft.Extensions.Hosting.Extensions.AddServiceDefaults(Microsoft.Extensions.Hosting.IHostApplicationBuilder)'

### .NET Version

8.0

### Anything else?

_No response_