Add ConsistencyLevel header to guest users count sample

Co-authored-by: jasonjoh <[email protected]>

Author: Copilot

sample-queries/sample-queries.json

@@ -125,6 +125,12 @@
       "humanName": "count the guest users in your organization",
       "requestUrl": "/v1.0/users/$count?$filter=userType eq 'guest'",
       "docLink": "https://docs.microsoft.com/en-us/graph/api/user-list?view=graph-rest-beta&tabs=http#example-6-get-only-a-count-of-users",
+      "headers": [
+        {
+          "name": "ConsistencyLevel",
+          "value": "eventual"
+        }
+      ],
       "tip": "We’d like to hear from you. Please leave your feedback on this API here: https://aka.ms/UsersAPIFeedback",
       "skipTest": false
     },