UI Support for Rotating AWS API Access Keys in Combined Access Method

NetBrain currently requires users to input AWS access key and secret key values for API accounts during initial onboarding, but provides no supported way to update these credentials afterward when a customer rotates or changes the keys; administrators must resort to direct database updates to apply the new values. This enhancement would add a UI-based option to update the user ID and access/secret key pair for existing AWS API accounts configured under the combined access method, without requiring backend intervention. Customers who follow periodic key rotation practices for security compliance would benefit from a supported, self-service way to keep AWS API credentials current and avoid dependency on manual database changes.