Decouple client tests (#12970)

* Add first version of evm utils

* Remove unused context util

* Add WSServer tests

* Add NewLegacyTransaction test

* Decouple client tests

* Update NewTestChainScopedConfig to apply correct defaults

* Move testutils

* Update paths

* Add changeset

.changeset/chilly-poems-crash.md

@@ -0,0 +1,5 @@
+---
+"chainlink": minor
+---
+
+Decouple client tests from core #internal

core/chains/evm/client/chain_client_test.go

@@ -12,10 +12,12 @@ import (
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
 
+	"github.com/smartcontractkit/chainlink-common/pkg/utils/tests"
+
 	commonclient "github.com/smartcontractkit/chainlink/v2/common/client"
 	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/client"
 	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/client/mocks"
-	"github.com/smartcontractkit/chainlink/v2/core/internal/testutils"
+	"github.com/smartcontractkit/chainlink/v2/core/chains/evm/testutils"
 )
 
 func newMockRpc(t *testing.T) *mocks.RPCClient {
@@ -33,7 +35,7 @@ func TestChainClient_BatchCallContext(t *testing.T) {
 	t.Parallel()
 
 	t.Run("batch requests return errors", func(t *testing.T) {
-		ctx := testutils.Context(t)
+		ctx := tests.Context(t)
 		rpcError := errors.New("something went wrong")
 		blockNumResp := ""
 		blockNum := hexutil.EncodeBig(big.NewInt(42))