Fix element-ref-across-components example

[guardrex]

Fixes #462

cc: @hakenr ... I'm going to paste the issue text here for easy reference. I'll chat with Dan and Larry soon about using the latest SDK to get the collection simplification feature.

The article section at ...

https://learn.microsoft.com/en-us/aspnet/core/blazor/javascript-interoperability/call-javascript-from-dotnet?view=aspnetcore-9.0#reference-elements-across-components

... is OK. However, the sample apps aren't fully functional. In the old days, the samples merely provided code. Lately, we've been fixing up the old samples to run as well. The element-ref-across-components approach requires a couple of changes in the early sample apps:

• The red CSS class is missing.
• The default/OOB SurveyPrompt in the homepage breaks the app because it doesn't adopt the strategy.

I also found out that the collection simplification can be placed into these pre-C# 12.0 apps because the latest compiler is smart enough to magically ✨ compile the code. I'll chat with Dan and Larry offline about the wisdom of having devs use the latest SDK for any given earlier version. We will NOT use the new C# feature. We'll just stick with ...

new object[] { value, "red" }

... in <8.0 code. AND ... it wouldn't build here anyway because I use the SDK for each release build in the code validation Action script.

[guardrex]

🎉

❤️ the code validation Action script! Fantastic! 😄