Flaky TestGatewayHaMultipleBackend.testQueryDeliveryToMultipleRoutingGroups

[ebyhr]

https://github.com/trinodb/trino-gateway/actions/runs/11074129878/job/30772227949

Error:  io.trino.gateway.ha.TestGatewayHaMultipleBackend.testQueryDeliveryToMultipleRoutingGroups -- Time elapsed: 0.219 s <<< FAILURE!
java.lang.AssertionError: 

Expecting actual:
  "Request to remote Trino server failed"
to contain:
  "http://localhost:20223" 
	at io.trino.gateway.ha.TestGatewayHaMultipleBackend.testQueryDeliveryToMultipleRoutingGroups(TestGatewayHaMultipleBackend.java:159)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1597)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1597)