Make the .NET check in aspire doctor based on the apphost language

Update aspire doctor to be aware of the fact that .NET does not need to be installed for polylgot scenarios.

```
.NET SDK
  ✗  .NET SDK not found
        Download .NET SDK from: https://dotnet.microsoft.com/download/dotnet/10.0
        See: https://dotnet.microsoft.com/download/dotnet/10.0
```
