Add net10.0 and net10.0-windows10.0.17763.0 target frameworks to CommunityToolkit.Mvvm

[Rolling2405]

Summary

Adds
et10.0 and
et10.0-windows10.0.17763.0 to CommunityToolkit.Mvvm's TargetFrameworks, following the existing LTS-only shipping pattern (net8.0 LTS → net10.0 LTS, skipping net9.0 STS).

Changes

• src/CommunityToolkit.Mvvm/CommunityToolkit.Mvvm.csproj: add
  et10.0;net10.0-windows10.0.17763.0 to TargetFrameworks
• ests/CommunityToolkit.Mvvm.Roslyn5000.UnitTests/: add
  et10.0 (was the only MVVM runtime test project missing it; all 408 tests pass)

Why no other changes are needed

All Windows-conditional property groups use IsTargetFrameworkCompatible(..., 'net8.0-windows10.0.17763.0') which returns rue for
et10.0-windows10.0.17763.0 automatically. All NET8_0_OR_GREATER symbols are true for net10.0, so no source code changes are required. The global.json already pins SDK 10.0.101, and CI uses global.json, so no CI changes are needed.

Verification

Built locally with dotnet build src/CommunityToolkit.Mvvm/CommunityToolkit.Mvvm.csproj -warnaserror: 0 warnings, 0 errors, with confirmed output for
et10.0\CommunityToolkit.Mvvm.dll and
et10.0-windows10.0.17763.0\CommunityToolkit.Mvvm.dll.

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