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.json

@@ -4746,11 +4746,6 @@
           "x-nullable": false,
           "x-omitempty": false
         },
-        "display_name": {
-          "type": "string",
-          "x-nullable": false,
-          "x-omitempty": false
-        },
         "downtime": {
           "type": "number",
           "x-nullable": false,
@@ -4761,16 +4756,6 @@
           "x-nullable": false,
           "x-omitempty": false
         },
-        "is_docker": {
-          "type": "boolean",
-          "x-nullable": false,
-          "x-omitempty": false
-        },
-        "is_excluded": {
-          "type": "boolean",
-          "x-nullable": false,
-          "x-omitempty": false
-        },
         "statuses": {
           "type": "array",
           "items": {