test: use T.TempDir to create temporary test directory

The directory created by `T.TempDir` is automatically removed when the
test and all its subtests complete.

Reference: https://pkg.go.dev/testing#T.TempDir
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

integration/pod_dualstack_test.go

@@ -31,9 +31,7 @@ import (
 )
 
 func TestPodDualStack(t *testing.T) {
-	testPodLogDir, err := os.MkdirTemp("", "dualstack")
-	require.NoError(t, err)
-	defer os.RemoveAll(testPodLogDir)
+	testPodLogDir := t.TempDir()
 
 	t.Log("Create a sandbox")
 	sb, sbConfig := PodSandboxConfigWithCleanup(t, "sandbox", "dualstack", WithPodLogDirectory(testPodLogDir))