List system egress network policies

{  "$schema": "https://api-dev.tektona.ai/schemas/ListSystemBody.json",  "items": [    {      "$schema": "https://api-dev.tektona.ai/schemas/Policy.json",      "allowed_cidrs": [        "string"      ],      "allowed_domains": [        "string"      ],      "denied_cidrs": [        "string"      ],      "denied_domains": [        "string"      ],      "description": "string",      "display_name": "string",      "extends": "string",      "name": "string"    }  ],  "system_denies": {    "cidrs": [      "string"    ],    "ports": [      0    ]  }}

{  "$schema": "https://api-dev.tektona.ai/schemas/ErrorModel.json",  "detail": "Property foo is required but is missing.",  "errors": [    {      "location": "string",      "message": "string",      "value": null    }  ],  "instance": "https://example.com/error-log/abc123",  "status": 400,  "title": "Bad Request",  "type": "https://example.com/errors/example"}