Manual sort order for device groups in Observability dashboard

The Observability dashboard currently sorts device groups only by alert count, from highest to lowest, with no option for users to define a custom display order. This enhancement would allow administrators to manually arrange device groups within the dashboard, such as by an assigned priority tier, rather than relying solely on alert volume. Customers who organize their network by business-defined priority levels would gain a dashboard view that reflects their operational priorities, improving triage efficiency and alignment with internal service tiers.