Add section on Blazor to Middleware overview

[guardrex]

Description

Part of the effort on #34356.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/middleware/?view=aspnetcore-9.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/fundamentals/middleware/index.md

Document ID

3926c686-0ccc-f9fe-ca52-0134612a1623

Article author

@guardrex

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