OCM-10871: Expose hcp_namespace field for Hypershift Model

[devppratik]

This PR updates the model to expose hcp_namespace field in the Hypershift model which is not available in SDK but can be queried via the API using the ocm get cluster $CLUSTER_ID/hypershiftendpoint

Related PR for model - https://github.com/openshift-online/ocm-api-model/pull/980

[andreadecorte]

not needed, changes autogenerated.