Set ExpirationTimestamp for Service's cluster

[venkataanil]

We want to set service & it's cluster expiry in our test. We tried with "ExpiredAt" function v1.NewManagedService().Service("ocm-addon-test-operator").ExpiredAt(time.Now().Add(time.Hour)). i.e setting to expire after one hour of creation i.e
2022/12/08 11:51:23 Debug - Request method is POST
2022/12/08 11:51:23 Debug - Request URL is 'https://api.integration.openshift.com/api/service_mgmt/v1/services'
2022/12/08 11:51:23 Debug - Request body follows
2022/12/08 11:51:23 Debug - {
"kind": "ManagedService",
"expired_at": "2022-12-08T12:51:23Z",
...
...
But in http POST method's response , I could see it set to 36 hours after created_at timestamp i.e
"created_at": "2022-12-08T11:51:27Z",
"expired_at": "2022-12-09T23:51:23.964498103Z",

Looks like it is using cluster's expiration_timestamp https://gitlab.cee.redhat.com/service/ocm-managed-services/-/blob/main/pkg/services/managed_services.go#L280 though user has provided ExpiredAt

We tried v1.NewManagedService().Cluster(v1.NewCluster().ExpirationTimestamp( However this cluster builder ( https://github.com/openshift-online/ocm-sdk-go/blob/main/servicemgmt/v1/cluster_builder.go ) is not having ExpirationTimestamp method.

May be we should use cluster builder from github.com/openshift-online/ocm-sdk-go/clustersmgmt/v1 for cluster inside service instead of https://github.com/openshift-online/ocm-sdk-go/blob/main/**servicemgmt**/v1/cluster_builder.go

Also we need to check from which ocm-sdk-go release we have this ExpirationTimestamp() function.

We should avoid testing services in CI till it gets fixed.