WebSocket compression/CSP and security guidance

[guardrex]

Fixes #31915
Addresses #31909

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Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/blazor-ef-core.md	ASP.NET Core Blazor with Entity Framework Core (EF Core)
aspnetcore/blazor/components/render-modes.md	ASP.NET Core Blazor render modes
aspnetcore/blazor/fundamentals/signalr.md	ASP.NET Core Blazor SignalR guidance
aspnetcore/blazor/security/index.md	aspnetcore/blazor/security/index
aspnetcore/blazor/security/server/interactive-server-side-rendering.md	Threat mitigation guidance for ASP.NET Core Blazor interactive server-side rendering

[guardrex]

🎉 Signed off by Javier offline (email)