'Go to definition' doesn't work for component type name in C#

[DoctorKrolic]

Version used:
VS 2022 v17.3 Preview 1

To reproduce:

1. Create blazor server-side project
2. Go to App.razor
3. 'Go to definition' on MainLayout

Expected behavior:
I appear in MainLayout.cs

Actual behavior:
Nothing happens

Demo:

Additional context:
Very similar to #6399, but in #6399 the defenition is .razor file, while here - .cs file

[davidwengier]

Moving this to the compiler. This is failing because Roslyn go-to-def says we should be navigating to the class declaration for the MainLayout class in the generated file, but as there is no source mapping for the type name in that declaration, we can't map that span to the Razor document.

Similar to #7099 and #7097