Update Blazor to .NET 10

[rajsite]

Pull Request

🤨 Rationale

• Update Blazor libraries to support .NET 10 in addition to .NET 8 (NimbleBlazor / SprightBlazor / OkBlazor).
• Standalone Blazor Wasm apps such as the Nimble Blazor example app may need to enable the following features:
  • Appears to be required (at least the Nimble Blazor example app seems to require it to be enabled to run): Fingerprint client-side static assets in standalone Blazor WebAssembly apps
  • Optional but worth enabling if you have already enabled fingerprinting: Preloaded Blazor framework static assets

👩‍💻 Implementation

• Update to a dotnet 10 sdk (10.0.300)
• Enable multiple TargetFrameworks for build / test / package deployment to support .net 10 and 8

🧪 Testing

• Verify in CI build logs that dotnet 10 and 8 are running
• Verified nuget package locally in Config App
• Verified blazor web app in storybook is still functional

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[jattasNI]

I skimmed a few Skyline .NET 10 upgrade PRs to see if there were any other common tasks we've done. (You can find these by looking through the history of global.json in some microservices).

One suggestion I found is to adopt the cleaner .slnx file format for the BlazorWorkspace.sln. But you can consider that optional / follow up if you want, not all services did it.

You might also ask some of the devs who did these upgrades (Paul, Darren, Aaron, etc) if there's anything else we should be thinking about.

[rajsite]

Added slnx, and will ping previous .NET updaters