feat: remove unused utils pkg

go/batch-submitter/utils/gas_price.go

-package utils
-
-import (
-	"math/big"
-
-	"github.com/ethereum/go-ethereum/params"
-)
-
-// GasPriceFromGwei converts an uint64 gas price in gwei to a big.Int in wei.
-func GasPriceFromGwei(gasPriceInGwei uint64) *big.Int {
-	return new(big.Int).SetUint64(gasPriceInGwei * params.GWei)
-}

go/batch-submitter/utils/gas_price_test.go

-package utils_test
-
-import (
-	"math/big"
-	"testing"
-
-	"github.com/ethereum-optimism/optimism/go/batch-submitter/utils"
-	"github.com/ethereum/go-ethereum/params"
-	"github.com/stretchr/testify/require"
-)
-
-// TestGasPriceFromGwei asserts that the integer value is scaled properly by
-// 10^9.
-func TestGasPriceFromGwei(t *testing.T) {
-	require.Equal(t, utils.GasPriceFromGwei(0), new(big.Int))
-	require.Equal(t, utils.GasPriceFromGwei(1), big.NewInt(params.GWei))
-	require.Equal(t, utils.GasPriceFromGwei(100), big.NewInt(100*params.GWei))
-}