remove Kentik steps from router creation and termination workflows

gso/services/kentik_client.py

@@ -114,7 +114,7 @@ class KentikClient:
 
     def create_device(self, device: NewKentikDevice) -> dict[str, Any]:
         """Add a new device to Kentik."""
-        plan_id = self.get_plan_by_name(self.config.billing_plans[device.site_tier])["id"]
+        plan_id = self.get_plan_by_name(self.config.placeholder_license_key)["id"]
         request_body = {
             "device": {
                 **device.model_dump(exclude=set("device_name" "site_tier")),