Blazor 8.0 offline discussion updates

[guardrex]

Description

This is a general issue to track the updates from offline discussion for 8.0 content. I believe most (or all) of the updates can be batched on one PR. I'll open followup issues/PRs if needed for anything that can't be batched on a single PR.

• Transient disposables ... WORK SEPARATELY ON Transient disposable section updates #31689
• BWA integration into the ASP.NET Core endpoint routing configuration. ... NO CHANGES NEEDED
  • Optional params are covered: https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/routing?view=aspnetcore-8.0#route-parameters
  • Route constraints are covered (and optional params with constraints): https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/routing?view=aspnetcore-8.0#route-constraints
  • "Custom constraints" and "Regex constraints" were never added to the article per our goal to generally avoid covering features that Blazor doesn't offer. If it becomes a ❓ for readers and we receive feedback, I'll add something later.
• MapFallBackToPage
• "Don't place a <script> tag in a component file"
• Passing tokens section ... WORK SEPARATELY ON Update section on passing tokens in Blazor Web Apps #31691
• Cross-origin protection section of the Threat mitigation topic ... SKIPPING FOR NOW ... we might add code examples if reader feedback indicates confusion.
• Configure and use gRPC in components section ... PARTIALLY ADDRESSED by resurfacing the content sans any remarks about hosted WASM or any code directly tied to the server app of a hosted WASM solution. Dan said he can/will supply a code example.
• Secure a SignalR hub section ... PARTIALLY ADDRESSED by resurfacing content sans any hosted WASM bits. Jeremy and/or Stephen will need to address the token question by DR.

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@guardrex