Support for variables in Intent Dashboard widgets

Intent Dashboards today cannot use parsed variable values, such as an SNMP contact field, to group or break down widget data. This enhancement would allow dashboard widgets to reference variables captured through Network Intents, so results can be aggregated or filtered by a variable value, such as team ownership or device attribute. Supporting variables in dashboards would let customers build more granular compliance and status reporting, such as showing compliant and non-compliant device counts organized by the responsible team, without requiring manual data manipulation outside the platform.