Apply single macro variable input across all devices during auto-intent execution

NetBrain currently requires users to manually supply macro variable input separately for each device when running auto-intent across multiple devices on a map, even when the same value applies to every device involved. This enhancement would allow a single macro variable input to be entered once and automatically applied to all devices selected on the map during auto-intent execution, eliminating the need for repetitive per-device entry. Customers running auto-intent workflows against large device sets would benefit from reduced manual effort and faster execution of automated diagnostics.