Function nodegroup_arn 

pub fn nodegroup_arn(
    region: &str,
    account_id: &str,
    cluster: &str,
    name: &str,
    id: &str,
) -> String

Build the ARN for a node group. AWS appends a random UUID segment after nodegroup/{cluster}/{name} so each node group’s ARN is unique even after a delete/recreate.