[Blazor] Disable custom cache in .NET 10

[maraf]

Disable custom cache in .NET 10 as we plan to completely remove it.

Contributes to dotnet/runtime#85775 and is required by dotnet/runtime#114901

[Copilot]

Pull Request Overview

This PR disables the custom caching mechanism in .NET 10 by updating MSBuild conditions to differentiate between target framework versions.

• Introduces new properties (_TargetingNETBefore80, _TargetingNET80OrLater, _TargetingNETBefore100, _TargetingNET100OrLater) to accurately detect framework versions.
• Updates the condition for BlazorCacheBootResources to disable caching on .NET 10 and later.
• Removes duplicate property group declarations to streamline the target file.

Comments suppressed due to low confidence (1)

src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.6_0.targets:56

• Ensure that the condition effectively disables caching for .NET 10 and later as intended. Consider verifying the logic against future framework changes.

    <BlazorCacheBootResources Condition="'$(BlazorCacheBootResources)' == '' and '$(_TargetingNET100OrLater)' != 'true'">true</BlazorCacheBootResources>

[dotnet-policy-service]

Thanks for your PR, @@maraf.
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