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.

先阅读 review 和 pull request #11016 的评论中描述的两个场景，然后跟踪 Management Server 如何记录 console-session 释放事件。根据 cloud.console_session 表验证该行为，并在每个已报告的场景都将 removed 设置为释放日期时间而不是保持为 NULL 时，视为工作完成。

由索引模型根据 Issue 内容生成。