Find references/definition not working for C++ code when the vscode-codeql extension is activated

[aeisenberg]

To reproduce:

1. Install ms-vscode.cpptools
2. Open a workspace with no codeql databases and ensure the vscode-codeql extension is not activated
3. Add a folder with C/C++ code
4. Notice that jump to definition is working
5. Add a codeql database
6. Try C++ code navigation again

BUG: Code navigation finds no definitions or references.