No step "Select a .NET runtime" during creating a C# HTTP Function

[v-xinda]

OS: All Build Version: 0.12.3-alpha.0 Regression: Not a regression

Repro Steps:

1. Open the empty folder in VS Code.
2. F1 -> Click "Azure Static Web Apps: Create HTTP Function..." -> Select C# language.
3. Check whether the next step is "Select a .NET runtime".

Expect: The next step is "Select a .NET runtime", like below:

Actual: No step "Select a .NET runtime".

More Info: The default .NET version is 6.0 after creating a C# HTTP Function.