Open in Editor codicon for test output inline action could be improved

Testing #186245

The codicon used for Open in Editor when you click on the inline action feels like an 'open external' (leaving the product), maybe we can use one of the go to file actions instead? cc @daviddossett 

<img width="229" alt="image" src="https://github.com/microsoft/vscode/assets/30305945/8a5777ef-533f-408a-973e-fc9d62b7c8db">
