Support Parsed Variables as Widget Data Sources in Intent Dashboards

Intent Dashboards currently support widgets based on alert conditions, such as identifying interfaces generating high utilization alerts, but cannot display the underlying parsed variable values themselves, such as actual interface input/output rates. This enhancement would allow parsed variables from Network Intents to be selected as data sources for dashboard widgets, enabling display of raw metric values alongside alert-based indicators. Customers monitoring critical infrastructure would gain more complete visibility into operational metrics without needing to build separate reporting workarounds.