show VM name in backup events

### The required feature described as a wish

On Cloudstack 4.22.1.0 the event list doesn't show the VM name for many backup everts.
For instance in the screenshot below the VM name is missing for the BACKUP.CREATE lines.
It will be very useful if the VM name is displayed especially when the event level is ERROR.

從 CloudStack 事件清單開始，追蹤 BACKUP.CREATE 事件的產生和呈現方式，重點關注事件層級為 ERROR 的情況。確認備份事件從何處取得其相關 VM 資訊；完成標準是備份事件列一律顯示 VM 名稱，包括 BACKUP.CREATE 錯誤。

由索引模型根據 Issue 內容生成。