Blazor BWA OIDC non-BFF/BFF samples update 9.0

[guardrex]

Addresses dotnet/AspNetCore.Docs#31909

Changes from 8.0 ...

• TFMs to net9.0.
• Package references (currently RC1 to be updated to GA later).
• Remove auth state provider services and replace with calls to AddAuthenticationStateSerialization (server-side) and AddAuthenticationStateDeserialization (client-side).
• Add a UserSecretsId to the project files of these new 9.0 sample apps but also add them to the 8.0 samples. Remove the Program file guidance on setting the client secret in code, both in the 9.0 and 8.0 samples. The article will explain how to use the Secret Manager tool for local dev and cross-link to guidance for other environments.

AFAICT, I don't need to enforce any static SSR pages (i.e., [ExcludeFromInteractiveRouting]) in these samples, but let me know if that's incorrect.

[halter73]

AFAICT, I don't need to enforce any static SSR pages (i.e., [ExcludeFromInteractiveRouting]) in these samples, but let me know if that's incorrect.

I think that's correct for this sample.