fix: lint issues

Change package for test to 'util_test' and add dot-import for the main package.

Author: stormqueen1990

kustomize/commands/internal/util/configmapSecretFlagsAndArgs_test.go

@@ -1,13 +1,14 @@
 // Copyright 2019 The Kubernetes Authors.
 // SPDX-License-Identifier: Apache-2.0
 
-package util
+package util_test
 
 import (
 	"reflect"
 	"testing"
 
 	"github.com/stretchr/testify/require"
+	. "sigs.k8s.io/kustomize/kustomize/v5/commands/internal/util"
 	"sigs.k8s.io/kustomize/kyaml/filesys"
 )