[ArPow] Onboard NuGet.client to arcade-powered source-build #2069
Description
- ArPow wrapper: in progress (crummel).
- Introduce Arcade to NuGet repo: in progress (crummel).
- build.sh changes: blocked by above (NuGet team).
- CI leg: in progress (crummel).
- Reconcile patches: blocked by CI (shared crummel/NuGet).