add 'products' taxonomy metadata and values (#5386)

Author: sudeepku

docfx.json

@@ -48,6 +48,7 @@
  "apiPlatform": "dotnet",
  "ms.topic": "managed-reference",
  "ms.prod": "dotnet-api",
+ "products": ["https://authoring-docs-microsoft.poolparty.biz/devrel/7696cda6-0510-47f6-8302-71bb5d2e28cf"],
  "feedback_system": "None",
  "defaultDevLang": "csharp",
  "_op_documentIdPathDepotMapping": {