chore: support local NuGet source via NOSCORE_LOCAL_PACKAGES env var

[erwan-joly]

Summary

• Adds a conditional RestoreAdditionalProjectSources PropertyGroup to Directory.Build.props that activates only when NOSCORE_LOCAL_PACKAGES is set.
• No runtime cost for contributors who don't opt in — the property group is skipped, restore uses nuget.org only.
• To use: setx NOSCORE_LOCAL_PACKAGES C:\LocalPackages, restart shell/VS, drop .nupkg files into the folder. Replaces the earlier NuGet.config-based attempt, which broke restore (NU1301) whenever the env var was unset.

Test plan

• dotnet restore succeeds with NOSCORE_LOCAL_PACKAGES unset.
• dotnet restore with NOSCORE_LOCAL_PACKAGES pointing to a folder with a .nupkg picks it up.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 0cab44bf-3221-4083-b82e-b918e60dbc7a

📥 Commits

Reviewing files that changed from the base of the PR and between 35d7e26 and 39af1e4.

📒 Files selected for processing (2)

• Directory.Build.props
• NuGet.config

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch revert-nuget-local-source

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