No IServiceMetadata Generated When Adding .NET Aspire Support

[Marvin Thobejane]

Describe the bug
When attempting to add .NET Aspire Orchestration support, the IServiceMetadata generated class isn't generated, causing a compile time error

To Reproduce
Steps to reproduce the behavior:

1. Create a new ca-sln solution
2. Add .NET Aspire Orchestration Support
3. Build the solution
4. See error

Expected behavior
An IServiceMetadata class to be generated

Additional context
This might be linked to dotnet/aspire#1563. I tried adding explicit project TFM instead of the Directory TFM without success.