Opening Data mapper via the code lens is not working

### Description

$subject.

### Steps to Reproduce

Follow the steps in https://ballerina.io/learn/vs-code-extension/implement-the-code/data-mapper/#open-via-the-codelens

https://github.com/user-attachments/assets/98a64532-4030-442e-9f6f-cfea64864cfe

### Version

5.1.0

### Environment Details (with versions)

_No response_