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_test.go

@@ -735,7 +735,7 @@ func TestEstimateGas(t *testing.T) {
 			t.Errorf("test %d: want no error, have %v", i, err)
 			continue
 		}
-		if uint64(result) != tc.want {
+		if float64(result) > float64(tc.want)*(1+estimateGasErrorRatio) {
 			t.Errorf("test %d, result mismatch, have\n%v\n, want\n%v\n", i, uint64(result), tc.want)
 		}
 	}