default long calculateDelegateCodeGasRefund(final long alreadyExistingAccountSize) {
    return 0L;
  }
Calculates the refund for processing the 7702 code delegation list if a delegator account
already exists in the trie.

@param alreadyExistingAccountSize The number of accounts already in the trie
@return the gas refund
evm/src/main/java/org/hyperledger/besu/evm/gascalculator/GasCalculator.java