eth/gasestimator: allow slight estimation error in favor of less iterations (#28618)

* eth/gasestimator: early exit for plain transfer and error allowance

* core, eth/gasestimator: hard guess at a possible required gas

* internal/ethapi: update estimation tests with the error ratio

* eth/gasestimator: I hate you linter

* graphql: fix gas estimation test

---------

Co-authored-by: Oren <orenyomtov@users.noreply.github.com>

internal/ethapi/api.go

@@ -51,6 +51,10 @@ import (
 	"github.com/tyler-smith/go-bip39"
 )
 
+// estimateGasErrorRatio is the amount of overestimation eth_estimateGas is
+// allowed to produce in order to speed up calculations.
+const estimateGasErrorRatio = 0.015
+
 // EthereumAPI provides an API to access Ethereum related information.
 type EthereumAPI struct {
 	b Backend
@@ -1189,10 +1193,11 @@ func DoEstimateGas(ctx context.Context, b Backend, args TransactionArgs, blockNr
 	}
 	// Construct the gas estimator option from the user input
 	opts := &gasestimator.Options{
-		Config: b.ChainConfig(),
-		Chain:  NewChainContext(ctx, b),
-		Header: header,
-		State:  state,
+		Config:     b.ChainConfig(),
+		Chain:      NewChainContext(ctx, b),
+		Header:     header,
+		State:      state,
+		ErrorRatio: estimateGasErrorRatio,
 	}
 	// Run the gas estimation andwrap any revertals into a custom return
 	call, err := args.ToMessage(gasCap, header.BaseFee)