Function remove_voter_refusal 

pub fn remove_voter_refusal(
    request: &RemoveRaftVoterRequest,
    cluster_id: &str,
    quorum: &QuorumStateSnapshot,
) -> Option<Refusal>

The refusal of a RemoveRaftVoter request before the reconfiguration, as KafkaRaftClient.handleRemoveVoterRequest orders it.