[Blazor] Use preloading in benchmark app

[maraf]

Apply preloading and fingerprinting placeholders to Wasm.Performance.TestApp

[maraf]

Failure is related

/home/vsts/work/1/s/.dotnet/sdk/10.0.100-preview.4.25216.37/Sdks/Microsoft.NET.Sdk.BlazorWebAssembly/targets/Microsoft.NET.Sdk.BlazorWebAssembly.6_0.targets(168,5): error : System.InvalidOperationException: No file exists for the asset at either location '/home/vsts/work/1/s/src/Components/benchmarkapps/Wasm.Performance/TestApp/bin/Release/net10.0/wwwroot/_framework/blazor.webassembly.js.cejseapcsj.map' or '/home/vsts/work/1/s/src/Components/benchmarkapps/Wasm.Performance/TestApp/bin/Release/net10.0/wwwroot/_framework/blazor.webassembly.js.cejseapcsj.map'. [/home/vsts/work/1/s/src/Components/benchmarkapps/Wasm.Performance/TestApp/Wasm.Performance.TestApp.csproj]
/home/vsts/work/1/s/.dotnet/sdk/10.0.100-preview.4.25216.37/Sdks/Microsoft.NET.Sdk.BlazorWebAssembly/targets/Microsoft.NET.Sdk.BlazorWebAssembly.6_0.targets(168,5): error :    at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.ResolveFile(String identity, String originalItemSpec) [/home/vsts/work/1/s/src/Components/benchmarkapps/Wasm.Performance/TestApp/Wasm.Performance.TestApp.csproj]
/home/vsts/work/1/s/.dotnet/sdk/10.0.100-preview.4.25216.37/Sdks/Microsoft.NET.Sdk.BlazorWebAssembly/targets/Microsoft.NET.Sdk.BlazorWebAssembly.6_0.targets(168,5): error :    at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssets.Execute() [/home/vsts/work/1/s/src/Components/benchmarkapps/Wasm.Performance/TestApp/Wasm.Performance.TestApp.csproj]

[maraf]

It needs SDK change from dotnet/sdk#49178

[Copilot]

Pull Request Overview

This PR adds preloading and fingerprinting placeholders to the Blazor WebAssembly benchmark application to improve performance measurement capabilities.

• Adds preloading support with WebAssembly preload link and import map script
• Enables fingerprinting placeholders in the Blazor script reference
• Configures the project to override HTML asset placeholders

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
blazor-frame.html	Adds preload link for WebAssembly, import map script, and fingerprinting placeholder in Blazor script src
Wasm.Performance.TestApp.csproj	Enables HTML asset placeholder overriding via MSBuild property