Cleanup dead code (#12929)

* Cleanup dead code

* Remove unneeded translation string

utils/test_files_compiler.go

@@ -10,21 +10,11 @@ import (
 	"os/exec"
 	"path/filepath"
 	"runtime"
-	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 )
 
-func goMod(t *testing.T, dir string, args ...string) {
-	cmd := exec.Command("go", append([]string{"mod"}, args...)...)
-	cmd.Dir = dir
-	output, err := cmd.CombinedOutput()
-	if err != nil {
-		t.Fatalf("Failed to %s: %s", strings.Join(args, " "), string(output))
-	}
-}
-
 func CompileGo(t *testing.T, sourceCode, outputPath string) {
 	dir, err := ioutil.TempDir(".", "")
 	require.NoError(t, err)