Request decomissioning of the network service.
The network service will enter the state of
decommission_requested. The request will
cascade to related network service and feature
configs.
An optional request body can be provided to request a specific service termination date.
If no date is given in the request body, it is assumed to be the earliest possible date.
Possible values for decommission_at can be queried
through the network_service_cancellation_policy_read
operation.
The response will contain the dates on which the changes will be effected.