test(spanner): set enterprise plus edition for asymmetric autoscaling… (#14788)

… sample

Author: sakthivelmanii

java-spanner/samples/snippets/src/main/java/com/example/spanner/CreateInstanceWithAsymmetricAutoscalingConfigExample.java

@@ -24,6 +24,7 @@
 import com.google.spanner.admin.instance.v1.AutoscalingConfig;
 import com.google.spanner.admin.instance.v1.CreateInstanceRequest;
 import com.google.spanner.admin.instance.v1.Instance;
+import com.google.spanner.admin.instance.v1.Instance.Edition;
 import com.google.spanner.admin.instance.v1.InstanceConfigName;
 import com.google.spanner.admin.instance.v1.ProjectName;
 import com.google.spanner.admin.instance.v1.ReplicaSelection;
@@ -78,6 +79,7 @@ static void createInstance(String projectId, String instanceId) {
               .setDisplayName(displayName)
               .setConfig(
                   InstanceConfigName.of(projectId, configId).toString())
+              .setEdition(Edition.ENTERPRISE_PLUS)
               .build();
 
       // Creates a new instance