Function massa_grpc::stream::send_endorsements::check_endorsement_draws

fn check_endorsement_draws(
    endorsements: &HashMap<String, SecureShareEndorsement>,
    selector_controller: &dyn SelectorController,
) -> Result<(), String>

Checks that each endorsement was created by the endorser drawn for its (slot, index) pair.

This mirrors the check done on endorsements received from peers (note_endorsements_from_peer) and in the endorsement pool: endorsements accepted here are handed over to the protocol propagation flow, which trusts its caller and rebroadcasts them without further validation.