CSV/Text File Import for AWS Account Onboarding

NetBrain currently requires customers to provide master or management account access credentials, including access ID and secret key, in order to automatically discover and onboard AWS accounts during onboarding. Many customers consider these credentials highly sensitive and are hesitant to share them, which creates friction in the onboarding process. This enhancement proposes allowing customers to import a list of AWS accounts from a CSV or text file as an alternative onboarding method, removing the need to supply master account credentials. Customers with strict security policies around credential sharing would benefit from a safer, more flexible onboarding path that still allows their AWS accounts to be configured in NetBrain.