chore: move the go code into a subfolder

apps/api/internal/zerrors/internal_test.go

@@ -0,0 +1,33 @@
+package zerrors_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/zitadel/zitadel/internal/zerrors"
+)
+
+func TestInternalError(t *testing.T) {
+	var err interface{} = new(zerrors.InternalError)
+	_, ok := err.(zerrors.Internal)
+	assert.True(t, ok)
+}
+
+func TestThrowInternalf(t *testing.T) {
+	err := zerrors.ThrowInternalf(nil, "id", "msg")
+	//nolint:errorlint
+	_, ok := err.(*zerrors.InternalError)
+	assert.True(t, ok)
+}
+
+func TestIsInternal(t *testing.T) {
+	err := zerrors.ThrowInternal(nil, "id", "msg")
+	ok := zerrors.IsInternal(err)
+	assert.True(t, ok)
+
+	err = errors.New("I am found!")
+	ok = zerrors.IsInternal(err)
+	assert.False(t, ok)
+}