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

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Co-authored-by: wxiaoguang <2114189+wxiaoguang@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

tests/integration/api_wiki_test.go

@@ -70,8 +70,7 @@ func TestAPIListWikiPages(t *testing.T) {
 	req := NewRequest(t, "GET", urlStr)
 	resp := MakeRequest(t, req, http.StatusOK)
 
-	var meta []*api.WikiPageMetaData
-	DecodeJSON(t, resp, &meta)
+	meta := DecodeJSON(t, resp, []*api.WikiPageMetaData{})
 
 	dummymeta := []*api.WikiPageMetaData{
 		{