Virtual workspace has duplicates for show call hierarchy

[rchiodo]

Make sure you have a fork of pylance-release in github (not cloned locally)

1. Create a virtual environment
2. Start VS code from a command prompt where this virtual environment is active
3. Make sure enableSyncServer is set
4. Run Open Remote Repository
5. Pick Open repository from Github
6. Type in your alias/pylance-release
7. Open the repository
   • This will just open the root of pylance
8. To get it to behave like a workspace, then do an Open Folder from the file menu and pick your alias/pylance-release/testing/single
9. Open the showCallHierarchy.py file and do a show call hierarchy for sqrt

Expected result:

Same as without virtual workspaces

Actual result:

callByName seems to be in the output twice:

Might be a dupe of #5809