Posture check: GCP Firewall rule allows all traffic on FTP port (21)
Query: ```config from cloud.resource where cloud.type = 'gcp' AND api.name = 'gcloud-compute-firewall-rules-list' AND json.rule = disabled is false and direction equals INGRESS and (sourceRanges[*] equals ::0 or sourceRanges[*] equals 0.0.0.0 or sourceRanges[*] equals 0.0.0.0/0 or sourceRanges[*] equals ::/0 or sourceRanges[*] equals ::) and allowed[?any(ports contains _Port.inRange(21,21) or (ports does not exist and (IPProtocol contains tcp or IPProtocol contains udp)))] exists```