Add properties that describe credentials to auth_userState (#878)

This change adds optional fields to auth_userState that describe the
credential type and backing source. This change supports an upcoming
change to the VS Toolkit.


## License

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: awschristou

telemetry/definitions/commonDefinitions.json

@@ -2689,10 +2689,18 @@
                     "type": "authStatus",
                     "required": true
                 },
+                {
+                    "type": "credentialSourceId",
+                    "required": false
+                },
                 {
                     "type": "credentialStartUrl",
                     "required": false
                 },
+                {
+                    "type": "credentialType",
+                    "required": false
+                },
                 {
                     "type": "source",
                     "required": true
@@ -6849,18 +6857,16 @@
             ],
             "passive": true
         },
-
         {
             "name": "toolkit_trackScenario",
             "description": "Generic metric for tracking arbitrary scenarios that are not yet formalized into a full metric.",
             "unit": "Count",
             "metadata": [
-               
                 {
                     "type": "amazonqConversationId",
                     "required": true
                 },
-                 {
+                {
                     "type": "count"
                 },
                 {
@@ -6932,4 +6938,4 @@
             ]
         }
     ]
-}
+}