🐛[BUG] ProTable中的表头分组后，使用列排序、拖动子级表头不生效

提问前先看看：

https://github.com/ryanhanwu/How-To-Ask-Questions-The-Smart-Way/blob/main/README-zh_CN.md

### 🐛 bug 描述
表头分组的情况下，二级表头的拖动无效，一级表头是正常的。

### 📷 复现步骤
https://oss-images-1310293673.cos.ap-chongqing.myqcloud.com/static/2024/01/2024-01-30/CleanShot-2024-January-30-10-09-22@2x.png

### 🏞 期望结果

### 💻 复现代码
https://codesandbox.io/p/sandbox/cha-xun-biao-ge-forked-33rznw

### © 版本信息

- ProComponents 版本: [e.g. 2.6.48]
- umi 版本
- 浏览器环境
- 开发环境 [e.g. mac OS]

### 🚑 其他信息

Start with the linked CodeSandbox reproduction and the ProTable implementation for grouped headers, sorting, and column dragging. Confirm the behavior described in the issue, then verify that child headers can be dragged and sorted while grouped headers remain functional.

Written by the indexing model from the issue text.