Function polkadot_node_subsystem_util::choose_random_subset_with_rng

pub fn choose_random_subset_with_rng<T, F: FnMut(&T) -> bool, R: Rng>(
    is_priority: F,
    v: &mut Vec<T>,
    rng: &mut R,
    min: usize,
)

Choose a random subset of min elements using a specific Random Generator Rng But always include is_priority elements.