Install .NET 10 SDK in Windows setup action

[pardeike]

Summary

• ensure the Windows test setup action installs the .NET 10 SDK so global.json requirements are met

Testing

• dotnet test HarmonyTests/HarmonyTests.csproj -c Release -f net9.0

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Install runtimes where setup-dotnet expects them

The new actions/setup-dotnet@v4 step installs the 10.0 SDK into the hosted tool cache and sets DOTNET_ROOT/disables multi-level lookup for the job. The later PowerShell block still drops all required runtimes into ${{steps.get-program-files.outputs.path}}/dotnet (Program Files). Because the active dotnet on PATH now points to the tool cache, it no longer sees those runtimes, so Windows .NET tests targeting netcoreapp3.x–net9.0 will fail with “No compatible framework version was found”. Install the extra runtimes into DOTNET_ROOT (or re-enable multi-level lookup) so the SDK can locate them.

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[github-actions]

Test Results

   128 files     128 suites   7m 59s ⏱️
   280 tests    277 ✅   3 💤 0 ❌
35 568 runs  34 992 ✅ 576 💤 0 ❌

Results for commit 3559f50.

♻️ This comment has been updated with latest results.