Preserve "Succeeded via SNMP" configuration retrieval status when CLI fails

NetBrain currently does not consistently report configuration retrieval status as "Succeeded via SNMP" when SNMP retrieval succeeds but CLI retrieval fails, differing from prior behavior customers relied on. This enhancement would restore the status display so that a successful SNMP-based configuration retrieval is clearly reflected even when CLI access fails for the same device. Customers depend on accurate status reporting to distinguish partial access success from full failure, and inconsistent labeling can lead to unnecessary troubleshooting and confusion about device accessibility.