Is it possible to specify multiple instance types for a managed node group? The EKS seem to say yes (https://docs.aws.amazon.com/eks/latest/userguide/create-managed-node-group.html search for “instance types”), the pulumi docs support getting passed an array but specify that they only support one element being in the array (https://www.pulumi.com/docs/reference/pkg/eks/managednodegroup/#instancetypes_nodejs)