Allow renaming of saved SNMP credential names

NetBrain currently does not allow a saved SNMP credential name to be edited; changing the name requires creating an entirely new credential entry, which leaves the original in place and can lead to duplicate or unused credential records over time. This enhancement would allow the name field of a saved SNMP credential to be edited directly without requiring a new credential to be created. Customers managing credential naming conventions or correcting entry errors would benefit from a simpler maintenance process and a cleaner credential list.