Align Blazor WebAssembly template content with the Blazor Web App template

[danroth27]

In #49801 we made a significant number of updates to the structure of the Blazor Web App template. We should make the same updates to the Blazor WebAssembly template for consistency. Specifically:

• New Components folder
• Cleaned up names and content for the Home, Counter, and Weather pages
• New Include sample pages option (and remove the Blazor WebAssembly Empty template)