Name-registry: Refactor get_timestamp_and_call to get the timestamp from a transaction

[K1-R1]

Once fuels-rs 0.42.0 is available, the test utility function get_timestamp_and_call can be refactored in order to get the timestamp from a transaction, as opposed to a hard-coded value. An example of how the refactor might look:

pub(crate) async fn get_timestamp_and_call<T, D>(
    handler: ContractCallHandler<T, D>,
) -> (FuelCallResponse<D>, u64)
where
    T: FuelAccount,
    D: Tokenizable + Debug,
{
    let call_response = handler.call().await.unwrap();
    let tx_id = call_response.tx_id;

    let provider = handler.account.try_provider().unwrap();
    let tx_response = provider
        .get_transaction_by_id(&tx_id)
        .await
        .unwrap()
        .unwrap();

    let time = tx_response.time.unwrap().timestamp().try_into().unwrap();

    (call_response, time)
}

This requires the release of fuels-rs 0.42.0 in order to access the tx_id from a FuelCallResponse, made available by:
FuelLabs/fuels-rs#734

This should also allow for testing on currently ignored tests