Remove methods for checking service/org name uniqueness

We don’t use these now – instead we try to update the name and see if
it works or not.

app/notify_client/organisations_api_client.py

@@ -81,12 +81,6 @@ class OrganisationsClient(NotifyAdminAPIClient):
         data = _attach_current_user({})
         return self.delete(endpoint, data)
 
-    def is_organisation_name_unique(self, org_id, name):
-        return self.get(
-            url="/organisations/unique",
-            params={"org_id": org_id, "name": name}
-        )["result"]
-
     def get_services_and_usage(self, org_id, year):
         return self.get(
             url=f"/organisations/{org_id}/services-with-usage",

app/notify_client/service_api_client.py

@@ -319,14 +319,6 @@ class ServiceAPIClient(NotifyAdminAPIClient):
         self._delete_template_cache_for_service(service_id)
         return self.post(endpoint, data=data)
 
-    def is_service_name_unique(self, service_id, name, email_from):
-        """
-        Check that the service name or email from are unique across all services.
-        """
-        endpoint = "/service/unique"
-        params = {"service_id": service_id, "name": name, "email_from": email_from}
-        return self.get(url=endpoint, params=params)["result"]
-
     # Temp access of service history data. Includes service and api key history
     def get_service_history(self, service_id):
         return self.get('/service/{0}/history'.format(service_id))['data']