change user_name still used as login and add display_name for dashboard view instead of username on login

backend/apps/operations/tests.py

@@ -12,7 +12,7 @@ from apps.operations.models import ChickenWeight, FeedSacks, IotPanel
 @override_settings(DASHBOARD_PUBLISH_HOUR=0)
 class OperationsAPITests(TestCase):
     def setUp(self):
-        self.user = User.objects.create_user(user_login="tester", password="secret")
+        self.user = User.objects.create_user(user_name="tester", password="secret")
         self.client = APIClient()
         self.client.force_authenticate(self.user)
         site = Site.objects.create(site_name="Sukawarna", user=self.user)
@@ -311,7 +311,7 @@ class OperationsAPITests(TestCase):
 @override_settings(DASHBOARD_PUBLISH_HOUR=17, TIME_ZONE="Asia/Jakarta")
 class DashboardVisibilityTests(TestCase):
     def setUp(self):
-        self.user = User.objects.create_user(user_login="tester", password="secret")
+        self.user = User.objects.create_user(user_name="tester", password="secret")
         self.client = APIClient()
         self.client.force_authenticate(self.user)
         site = Site.objects.create(site_name="Sukawarna", user=self.user)