Blazor Server script fallback policy authorization

[guardrex]

Fixes #31931

Thank you @CoskunSunali for that great write-up 🥇. I've combined your remarks with Stephen's response to address this subject in the Migration article. It's here for review if you would like to provide feedback 👂.

Stephen said on the issue ...

It looks like the documentation at https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/blazor/fundamentals/static-files.md ought to be updated to reflect that Blazor static files no longer rely on UseStaticFiles and instead are mapped using endpoint routing.

... but I think I need a more specific change set to update the article. I'm also not generally clear what "Blazor static files" means ... I don't think he meant that Static File Middleware no-ops in BWAs. I think he means that static assets managed by Blazor (the framework) are now (8.0+) mapped via endpoint routing. Anyway, a specific change set for the article would be helpful. I'd like to knock it out 🤜😵 on this PR if possible. If not tho ... I can open a new issue to address it later.

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Internal previews

📄 File	🔗 Preview link
aspnetcore/migration/70-80.md	Migrate from ASP.NET Core in .NET 7 to .NET 8

[CoskunSunali]

Thank you @CoskunSunali for that great write-up 🥇. I've combined your remarks with Stephen's response to address this subject in the Migration article. It's here for review if you would like to provide feedback 👂.

Thank you for your compliment @guardrex!

The PR looks good to me.

[CoskunSunali]

Looks good to me!

[guardrex]

Thanks, @CoskunSunali.

[guardrex]

I opened #32054 to address the Static Files Middleware/endpoint routing situation.

For this, I'll go ahead. I faithfully convey Stephen's remarks.