refactor(metrics): remove unused fields from RouteAggregate and update related documentation

- Removed `display_name`, `is_docker`, and `is_excluded` fields from the `RouteAggregate` struct and corresponding Swagger documentation.
- Updated references in the README and code to reflect the removal of these fields, ensuring consistency across the codebase.

internal/api/v1/docs/swagger.yaml

@@ -1154,16 +1154,10 @@ definitions:
         - napping
         - starting
         type: string
-      display_name:
-        type: string
       downtime:
         type: number
       idle:
         type: number
-      is_docker:
-        type: boolean
-      is_excluded:
-        type: boolean
       statuses:
         items:
           $ref: '#/definitions/RouteStatus'