Update Blazor Web App to .NET 8.0

[vsteele]

The example for Blazor Server App is for .NET 6, which is outdated for the setup with .NET 8 Blazor Web Apps. Would be great to have an up to date sample for the Microsoft Entra ID/Identity sign on.

[guardrex]

Just here passing thru adding an issue for something else, and I noticed your request. We now have that sample in both BFF and non-BFF patterns in the ASP.NET Core docs and sample repo. See .............

https://learn.microsoft.com/en-us/aspnet/core/blazor/security/blazor-web-app-with-entra?view=aspnetcore-9.0&pivots=non-bff-pattern