Management Server does not recognize a session as removed in some scenarios

### Problem Description

In some scenarios, the Management Server does not recognize that a console session has been released. As a consequence of that, the `removed` column of the `cloud.console_session` table remains indefinitely marked as `NULL`.

### Versions

ACS versions 4.19 and 4.20

### The steps to reproduce the bug

- https://github.com/apache/cloudstack/pull/11016#pullrequestreview-2993780512 and https://github.com/apache/cloudstack/pull/11016#issuecomment-3052399701 describe two different situations in which this bug occur.

### What to do about it?

Normalize these scenarios, ensuring that the `removed` attribute of console sessions is corretly set to the datetime in which the sessions are released.

先閱讀 review 和 pull request #11016 的留言中描述的兩個情境，然後追蹤 Management Server 如何記錄 console-session 釋放事件。根據 cloud.console_session 資料表驗證此行為，並在每個已回報的情境都將 removed 設為釋放日期時間，而不是保持為 NULL 時，視為工作完成。

由索引模型根據 Issue 內容生成。