[Blazor] Template cleanup work

[javiercn]

• Switch to use bootstrap for icons https://icons.getbootstrap.com/
  • [ ] Alternatively use some inline SVGs.
• Remove the Blazor Server template.
• Remove the hosted option for the Blazor WebAssembly template.
• Remove suppress-error from https://github.com/dotnet/aspnetcore/blob/main/src/ProjectTemplates/Web.ProjectTemplates/content/Components-CSharp/App.razor#L52
  • Depends on [Blazor] Remove blazor script check razor#8744