🤔请问明细表中mergedCellsInfo合并单元格后如何复制合并的单元格

### 🏷 Version

| Package | Version |
| -------------- | ------- |
| @antv/s2 | 1.33.1 |
| @antv/s2-react | |
| @antv/s2-vue | |

### Sheet Type

- [ ] PivotSheet
- [x] TableSheet
- [ ] GridAnalysisSheet
- [ ] StrategySheet
- [ ] EditableSheet

### 🖋 Description
在明细表中，config配置了mergedCellsInfo，如何选中合并的单元格并通过内置的enableCopy交互复制合并的单元格

### 🔗 Reproduce Link
https://codesandbox.io/s/busy-hofstadter-w6sl3q

### 😊 Expected Behavior
期望能够复制合并的单元格信息
### 😅 Current Behavior
合并的单元格无法选中也无法复制

Open the linked CodeSandbox reproduction and inspect the TableSheet configuration using mergedCellsInfo and the built-in enableCopy interaction. Reproduce the inability to select or copy merged cells, then trace the relevant selection and copy behavior. Done means merged cells can be selected and their merged-cell information can be copied through the built-in interaction.

Written by the indexing model from the issue text.