Function select_runnable_task_index_with_target 

pub fn select_runnable_task_index_with_target(
    active: &QueueFile,
    done: Option<&QueueFile>,
    target_task_id: &str,
    operation: &str,
    options: RunnableSelectionOptions,
) -> Result<usize>

Select a runnable task index by target task id, with validation.