refactor(qod): rename NETWORK_CAPABILITY operation types to QOD_SESSION

Both QoD and Traffic Influence are network capabilities, so the NETWORK_CAPABILITY name didn't say which one an operation belonged to. Rename the QoD members to match the TRAFFIC_INFLUENCE ones and the capability_type QoD already sends to SRM:

• NETWORK_CAPABILITY -> QOD_SESSION ("qod_session")
• NETWORK_CAPABILITY_DEACTIVATE -> QOD_SESSION_DEACTIVATE ("qod_session_deactivate")

This is internal to OEG: the commands sent to SRM are unchanged. The stored operation_type values change too, so existing rows that still hold the old values must be updated or the database reset.