Migrate to cascading auth state services

[guardrex]

Fixes #31056

Thanks @xunmeng2002! 🚀 ... I'm sorry that we didn't have these updates! It didn't make some of the product unit lists that I received, so it slipped through the cracks and didn't get covered for release.

This PR should cover it now everywhere that we had guidance on the CascadingAuthenticationState component, AND I added a section to the 8.0 Migration article to highlight it.

I'm going to merge this quickly 🏃 and take it live immediately. It should appear in the live articles within 20 minutes.

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Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/security/index.md	ASP.NET Core Blazor authentication and authorization
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-31065)
aspnetcore/blazor/security/webassembly/hosted-with-azure-active-directory-b2c.md	Secure a hosted ASP.NET Core Blazor WebAssembly app with Azure Active Directory B2C
aspnetcore/blazor/security/webassembly/hosted-with-identity-server.md	Secure a hosted ASP.NET Core Blazor WebAssembly app with Identity Server
aspnetcore/blazor/security/webassembly/hosted-with-microsoft-entra-id.md	aspnetcore/blazor/security/webassembly/hosted-with-microsoft-entra-id
aspnetcore/migration/70-80.md	Migrate from ASP.NET Core 7.0 to 8.0