Posture check: GCP PostgreSQL instance database flag log_duration is not set to on
Query: ```config from cloud.resource where cloud.type = 'gcp' AND api.name = 'gcloud-sql-instances-list' AND json.rule = "state equals RUNNABLE and databaseVersion contains POSTGRES and (settings.databaseFlags[*].name does not contain log_duration or settings.databaseFlags[?any(name contains log_duration and value contains off)] exists)"```