BWA with WinAuth article

[guardrex]

Fixes #34707

Notes

• Adds a WinAuth sample app article to the Blazor Security and Identity node.
• The sample app is at https://github.com/dotnet/blazor-samples/tree/main/9.0/BlazorWebAppWinAuthServer.

❓***QUESTION:***❓ We want to show claims and how to set a policy for a Win SID. Is there anything else that we need this sample app to show, or is this enough to get folks going?

Thanks @markat1 for requesting this sample and coverage.

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Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/security/blazor-web-app-with-entra.md	aspnetcore/blazor/security/blazor-web-app-with-entra
aspnetcore/blazor/security/blazor-web-app-with-oidc.md	aspnetcore/blazor/security/blazor-web-app-with-oidc
aspnetcore/blazor/security/blazor-web-app-with-windows-authentication.md	aspnetcore/blazor/security/blazor-web-app-with-windows-authentication
aspnetcore/toc.yml	aspnetcore/toc

[mikekistler]

This is a new area to me, so some of my comments may be just from lack of knowledge. Take them with a grain of salt.

[guardrex]

Made some updates on the last two commits ☝️ 👇 ...

• I added the WinAuth ASP.NET Core article cross-link to the introductory remarks.
• I decided to drop the sections from H3 to H2 because I want them to show up in the article's sidebar ToC.
• Fleshed out the "fallback policy" language. I didn't need to do much with the "default policy" language because it already basically said that the policy is to require an authenticated user.