Route Renovate npm lookup through CFS

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 3eb6a0bd-11cc-4d7a-97ce-16e5d553f215

Author: missymessa

eng/renovate.json

@@ -81,6 +81,7 @@
       ],
       "depNameTemplate": "renovate",
       "datasourceTemplate": "npm",
+      "registryUrlTemplate": "https://packagefeedproxy.microsoft.io/npm/",
       "extractVersionTemplate": "^(?<version>\\d+)",
       "versioningTemplate": "loose"
     },