Project outline view refresh issue adding CMake project to workspace

### Brief Issue Summary

Starting from a workspace having a CMake project up and running already, proceeding to `add folder to workspace` targeting another CMake project, I'm ending with empty project outline while CMake is proceeding to right configure step.

The very same happens if I rely on some extensions promoting by the end of their process some `vscode.workspace.updateWorkspaceFolders(vscode.workspace.workspaceFolders ? vscode.workspace.workspaceFolders.length : 0, null, { uri: projectUri });` programmatic addon to workspace.

Both case, project outline is being populating forcing a `Developer : windows reload`

I suspect some event missing or not considered playing with multiroot workspace ... but only a guess.
Any comment, advice, .. welcome ! Thanks already.

PS: seen in the past, my latest trial is based on 1.20.52 CMake tools extension, VSCode 1.97.2 & Windows 10 OS

### CMake Tools Diagnostics

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### Debug Log

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### Additional Information

_No response_

Start by reproducing the issue with an existing CMake project, then add a second project through VS Code's Add Folder to Workspace flow and the reported vscode.workspace.updateWorkspaceFolders call. Trace how the project outline refreshes while CMake configures; done means the outline populates without requiring a Developer: Windows Reload.

Written by the indexing model from the issue text.