Missing event - ErrorinPrepareForMaintenance

### problem

If an error occurs when enabling maintenance mode, no corresponding event is created.

Events:

### versions

ACS: 4.22.1.0

### The steps to reproduce the bug

Example how to reproduce:
1. Create enough VMs to use up almost all available memory in the cluster
2. Enable Maintenance for one host
3. ErrorinPrepareForMaintenance will show up on the host
4. Check Events - no error is generated

### What to do about it?

_No response_

未指定來源檔案或測試。透過在叢集記憶體壓力下的主機上啟用維護來重現故障，然後追蹤維護模式錯誤事件的路徑並檢視已開啟的 pull request #13669；當建立 ErrorinPrepareForMaintenance 事件，且相關的事件行為已由測試涵蓋時，即視為完成。

由索引模型根據 Issue 內容生成。