[Pre4] Preloaded Blazor framework assets

[guardrex]

Fixes #35273

The Migration article will explain adding the markup to standalone WASM apps, and that guidance is typically created much later in the release cycle (RC time frame).

---

Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/fundamentals/static-files.md	aspnetcore/blazor/fundamentals/static-files

[guardrex]

@maraf ... No rush on this ... just a reminder ping that this is here.

UPDATE (5/12): I'll merge by mid-day today (Monday) to unblock me for the final round of P4 updates.

[guardrex]

This is blocking now, so I'll need to go ahead and merge it.

The blocking problems with multiple PRs working on What's New content should go away at P5 or later 🤞 because we'll be adopting the new coverage approach where PU engineers will supply all preview content to me by two weeks before preview release and all content will go on one PR.

If you spot problems with this, ping me here, and I'll get a patch PR in place.

I'll get the two steps for this in place in the Migration article in the RC time frame when that article is fleshed out. Readers of this content will follow the "for more information" link to see the two aspects in the reference guidance.