Allow iBGP update on both provisioning and active trunks

Updated unit tests accordingly. iBGP update is allowed only on routers with a provisioning or active trunk, not initial or terminated.

gso/workflows/router/update_ibgp_mesh.py

@@ -40,7 +40,7 @@ def initial_input_form_generator(subscription_id: UUIDstr) -> FormGenerator:
                 subscription_id, SubscriptionLifecycle.PROVISIONING
             ) + get_trunks_that_terminate_on_router(subscription_id, SubscriptionLifecycle.ACTIVE)
             if len(terminating_trunks) == 0:
-                msg = "Selected router does not terminate any active IP trunks."
+                msg = "Selected router does not terminate any available IP trunks."
                 raise ValueError(msg)
 
             return values