[build] Provision .NET SDK via standard scripts, drop xaprepare's installer#11636

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Commits on Jun 11, 2026

Migrate .NET SDK provisioning to Arcade scripts

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Read SDK version from eng/Versions.props, drop global.json:tools.dotnet

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Commits on Jun 12, 2026

Make eng/install-dotnet.sh executable

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Invoke install-dotnet.sh via `bash` so executable bit is not required

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