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>

graphql/graphql_test.go

@@ -139,7 +139,7 @@ func TestGraphQLBlockSerialization(t *testing.T) {
 		// should return `estimateGas` as decimal
 		{
 			body: `{"query": "{block{ estimateGas(data:{}) }}"}`,
-			want: `{"data":{"block":{"estimateGas":"0xcf08"}}}`,
+			want: `{"data":{"block":{"estimateGas":"0xd221"}}}`,
 			code: 200,
 		},
 		// should return `status` as decimal