chore: skip depreciated linked ticket tests

ref: #833

Author: jon-nfc

app/itam/tests/unit/operating_system/test_operating_system_item_ticket_api_v2.py

@@ -11,6 +11,7 @@
 
 
 
+@pytest.mark.skip( reason = 'this ticket model is depreciated' )
 @pytest.mark.model_operatingsystem
 @pytest.mark.module_itam
 class OperatingSystemItemTicketAPI(

app/itim/tests/unit/cluster/test_cluster_item_ticket_api_v2.py

@@ -11,6 +11,7 @@
 
 
 
+@pytest.mark.skip( reason = 'this ticket model is depreciated' )
 @pytest.mark.model_cluster
 @pytest.mark.module_itim
 class ClusterItemTicketAPI(

app/itim/tests/unit/service/test_service_item_ticket_api_v2.py

@@ -10,7 +10,7 @@
 from itim.models.services import Service
 
 
-
+@pytest.mark.skip( reason = 'this ticket model is depreciated' )
 @pytest.mark.model_service
 @pytest.mark.module_itim
 class ServiceItemTicketAPI(