Enable the `OpenExamplesFolder` unit test

[andyleejordan]

Prerequisites

• [X] I have written a descriptive issue title.
• [X] I have searched all issues to ensure it has not already been reported.

Summary

Added but also disabled in #3570:

https://github.com/PowerShell/vscode-powershell/blob/bf1091669aa8b0983bc17d85b156f847ffdae115/test/core/paths.test.ts#L14-L19

Proposed Design

No response