Fix TestIntegration_BlockHistoryEstimator leak (#11741)

* Fix TestIntegration_BlockHistoryEstimator leak

* Use servicetest.Run

core/internal/features/features_test.go

@@ -40,6 +40,7 @@ import (
 	ocrtypes "github.com/smartcontractkit/libocr/offchainreporting/types"
 
 	commonconfig "github.com/smartcontractkit/chainlink-common/pkg/config"
+	"github.com/smartcontractkit/chainlink-common/pkg/services/servicetest"
 	"github.com/smartcontractkit/chainlink/v2/core/auth"
 	"github.com/smartcontractkit/chainlink/v2/core/bridges"
 	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/assets"
@@ -1319,7 +1320,7 @@ func TestIntegration_BlockHistoryEstimator(t *testing.T) {
 
 	legacyChains := evmrelay.NewLegacyChainsFromRelayerExtenders(cc)
 	for _, re := range cc.Slice() {
-		require.NoError(t, re.Start(testutils.Context(t)))
+		servicetest.Run(t, re)
 	}
 	var newHeads evmtest.RawSub[*evmtypes.Head]
 	select {
@@ -1343,6 +1344,7 @@ func TestIntegration_BlockHistoryEstimator(t *testing.T) {
 		elems := args.Get(1).([]rpc.BatchElem)
 		elems[0].Result = &b43
 	})
+	ethClient.On("Close").Return().Once()
 
 	// Simulate one new head and check the gas price got updated
 	h43 := cltest.Head(43)