Refactor integration test DecodeJSON calls to use generic return value (#37432)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <2114189+wxiaoguang@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

tests/integration/api_label_templates_test.go

@@ -22,8 +22,7 @@ func TestAPIListLabelTemplates(t *testing.T) {
 	req := NewRequest(t, "GET", "/api/v1/label/templates")
 	resp := MakeRequest(t, req, http.StatusOK)
 
-	var templateList []string
-	DecodeJSON(t, resp, &templateList)
+	templateList := DecodeJSON(t, resp, []string{})
 
 	for i := range repo_module.LabelTemplateFiles {
 		assert.Equal(t, repo_module.LabelTemplateFiles[i].DisplayName, templateList[i])
@@ -45,8 +44,7 @@ func TestAPIGetLabelTemplateInfo(t *testing.T) {
 	req := NewRequest(t, "GET", urlStr)
 	resp := MakeRequest(t, req, http.StatusOK)
 
-	var templateInfo []api.LabelTemplate
-	DecodeJSON(t, resp, &templateInfo)
+	templateInfo := DecodeJSON(t, resp, []api.LabelTemplate{})
 
 	labels, err := repo_module.LoadTemplateLabelsByDisplayName(templateName)
 	assert.NoError(t, err)