Function validate_slot_number_presence 

pub fn validate_slot_number_presence<T>(
    chain_spec: &T,
    version: EngineApiMessageVersion,
    message_validation_kind: MessageValidationKind,
    timestamp: u64,
    has_slot_number: bool,
) -> Result<(), EngineObjectValidationError>
where
    T: EthereumHardforks,

Validates the presence of the slot number field according to the payload timestamp. After Amsterdam, slot number field must be Some. Before Amsterdam, slot number field must be None;