use campaign resource object in tests

Author: kanat

stream_chat/tests/async_chat/test_campaign.py

@@ -78,8 +78,7 @@ async def test_get_campaign_with_user_pagination(self, client: StreamChatAsync,
         campaign_id = created["campaign"]["id"]
 
         # Test get_campaign with user pagination options
-        response = await client.get_campaign(
-            campaign_id=campaign_id,
+        response = await campaign.get(
             options={"users": {"limit": 2}}  # Limit to 2 users per page
         )
         assert response.is_ok()
@@ -89,7 +88,7 @@ async def test_get_campaign_with_user_pagination(self, client: StreamChatAsync,
         assert len(response["campaign"]["users"]) <= 2  # Verify pagination limit worked
 
         # Cleanup
-        await client.delete_campaign(campaign_id=campaign_id)
+        await campaign.delete()
 
     async def test_campaign_start_stop(
         self, client: StreamChatAsync, random_user: Dict