Posture check: GCP PostgreSQL instance database flag log_min_duration_statement is not set to -1
Query: ```config from cloud.resource where cloud.type = 'gcp' AND api.name = 'gcloud-sql-instances-list' AND json.rule = "databaseVersion contains POSTGRES and (settings.databaseFlags[?(@.name=='log_min_duration_statement')] does not exist or settings.databaseFlags[?(@.name=='log_min_duration_statement')].value does not equal -1)"```