Validate catch-all routing support in Blazor

[captainsafia]

Validate the feature introduced in #24038.

[captainsafia]

Works well!

@guardrex Let's document this for RC1. Users can now specify catch-all route parameters like so.

@page "/page/{*pageRoute}

@code {
  [Parameter] public string PageRoute {get; set; }
}

When a user visits a page like /page/this/is/a/test then the value of PageRoute will be set to /this/is/a/test. The catch-all parameter must be a string type since we don't support casting for it. Also, the catch-all route parameter must appear at the end of the URL.

Let me know if you need more details about this feature.

Addendum: Feeling some slight deja-vu that I might've already asked for docs on this. If so, ignore this!