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.

从 CloudStack 事件列表开始，跟踪 BACKUP.CREATE 事件的生成和呈现方式，重点关注事件级别为 ERROR 的情况。确定备份事件从何处获取其相关 VM 信息；完成标准是备份事件行始终显示 VM 名称，包括 BACKUP.CREATE 错误。

由索引模型根据 Issue 内容生成。