Tighter check for replica service in pgo test

The check looked to see if the word "replica" existed in one
of the Service Labels, when really we shold be checking for a
suffix of "replica".

Issue: [ch9764]
Issue: #2047

Author: jkatz

internal/apiserver/clusterservice/clusterimpl.go

@@ -488,7 +488,7 @@ func TestCluster(name, selector, ns, pgouser string, allFlag bool) msgs.ClusterT
 			switch {
 			default:
 				endpoint.InstanceType = msgs.ClusterTestInstanceTypePrimary
-			case strings.Contains(service.Name, msgs.PodTypeReplica):
+			case strings.HasSuffix(service.Name, msgs.PodTypeReplica):
 				endpoint.InstanceType = msgs.ClusterTestInstanceTypeReplica
 			case service.Pgbouncer:
 				endpoint.InstanceType = msgs.ClusterTestInstanceTypePGBouncer