[BUG] VS Code selecting wrong Aspire template version by default

[claudiaregio]

Describe the Issue

I do not have the .NET 9 SDK, but updating to the latest versions of the Aspire templates leads to VS Code picking the .NET 9 versions by default. Leads me to having "Failed to restore NuGet packages for the solution" error and putting me in a bad state.

Steps To Reproduce

1. Have only .NET 8 installed
2. Run dotnet new install Aspire.ProjectTemplates
3. Create new project in VS Code-> .NET Aspire Starter App -> Click "Show all template options"
4. Default that is selected is .NET 9 SDK but I don't have the .NET 9 SDK.

Expected Behavior

For the default to be the latest version based on the SDKs I actually have installed

OR

For C# Dev Kit to warn me and offer to help me install the .NET 9 (or whatever corresponding SDK is in the future)

Environment Information

Apple M2 Pro
Sonoma 14.2.1
VS Code Version: 1.95.3
C# Dev Kit: v.1.13.9

[timheuer]

Thanks...I think we knew this might be a situation with the new template aspect. @DamianEdwards wasn't this one of the scenarios we knew might happen without the proper TFM check on the template engine?