Function start_added_nodes 

pub async fn start_added_nodes(
    layout: &AssetsLayout,
    state: &mut State,
    node_ids: &[u32],
    total_nodes: u32,
    rust_log: &str,
    seed: Arc<str>,
) -> Result<Vec<RunningProcess>>

Start newly added nodes and track their node/sidecar processes in state.