Use the PowerToys dependency feed

[Gordon Lam (yeelam-gordon)]

Summary

• Route all NuGet restores through the PowerToys dependency feed.
• Align the Command Palette extension with PowerToys package sourcing and avoid direct nuget.org access.
• Change only the checked-in nuget.config package source.

Validation

• A clean cold restore through the PowerToys dependency feed succeeded locally.
• GitHub Actions and ADO checks are being rerun.

[Copilot]

Pull request overview

This PR updates the Azure DevOps (ADO) build pipeline to restore NuGet packages exclusively from an internal Azure Artifacts feed, while keeping the repo’s checked-in nuget.config unchanged for local development and GitHub Actions.

Changes:

• Added an internal-feed-only NuGet configuration (build/nuget.config.internal) that clears all sources and maps all packages to the DevHome.nuget.internal feed.
• Updated the ADO pipeline to authenticate NuGet feeds and copy the internal NuGet config over the repo root nuget.config before building/restoring.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
build/nuget.config.internal	Introduces an internal-only NuGet config with package source mapping to the DevHome internal feed.
build/azure-pipelines.yml	Adds NuGet feed authentication and replaces the root NuGet config during ADO jobs to force internal-feed restores.

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[Michael Jolley (michaeljolley)]

LGTM