Run Diagnosis on All Selected Devices in Chatbot Multi-Select

NetBrain's Chatbot currently limits diagnosis execution to only the first device when multiple devices are selected, rather than running diagnosis across all selected devices. This enhancement would restore and formalize support for running diagnosis on every device selected in a multi-device Chatbot selection, ensuring consistent behavior regardless of how many devices are chosen. Customers troubleshooting multiple devices simultaneously would benefit from a more efficient workflow that avoids repeating manual selections for each device.