SandboxBackgroundCommandOutput

Field	Type
`commandId`	`ID!`
`command`	`String!`
`status`	`SandboxBackgroundCommandStatus!`
`exitCode`	`Int`
`signal`	`String`
`startedAt`	`DateTime`
`finishedAt`	`DateTime`
`heartbeatStatus`	`SandboxCommandHeartbeatStatus!`
`lastHeartbeatAt`	`DateTime`
`lastHeartbeatError`	`String`
`heartbeatFailureCount`	`Int!`
`stdout`	`String!`
`stderr`	`String!`
`stdoutTruncated`	`Boolean!`
`stderrTruncated`	`Boolean!`