Blazor options configuration 8.0

[guardrex]

Fixes #30843

cc: @shrayasr ... A 🏅 for opening an issue. This will help others in a similar situation.

Cross-linking a few existing options config sections for migration guidance ... ➕ PLUS ➕ adding a couple of missing options.

I also see that we never had good MapBlazorHub guidance. It was part of the tutorial but not in a reference doc section. This PR will fix that 😈.

---

Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/fundamentals/handle-errors.md	Handle errors in ASP.NET Core Blazor apps
aspnetcore/blazor/fundamentals/signalr.md	ASP.NET Core Blazor SignalR guidance
aspnetcore/blazor/fundamentals/static-files.md	ASP.NET Core Blazor static files
aspnetcore/blazor/security/server/index.md	[Visual Studio](https://review.learn.microsoft.com/en-us/aspnet/core/blazor/security/server/index?branch=pr-en-us-30845)
aspnetcore/migration/70-80.md	aspnetcore/migration/70-80