cook: renotify agents when waiting for deployment (#42956)

hobo/environment/management/commands/cook.py

@@ -108,7 +108,11 @@ class Command(BaseCommand):
         t0 = time.time()
         i = 0
         last_service_url = None
+        last_notification = t0
         while len(services) > 0:
+            if time.time() - last_notification > 15:
+                last_notification = time.time()
+                notify_agents(None)
             for service in services[:]:
                 if service.last_operational_success_timestamp:
                     services.remove(service)