ansys-mechanical-ideconfig generating duplicate paths in vscode json

if cli called twice then the vscode settings json has modified twice and paths are written multiple times

Start by reproducing the issue by running ansys-mechanical-ideconfig twice and inspecting the generated VS Code settings JSON. Trace the command's configuration-writing entry point and verify that repeated runs do not add duplicate paths or modify the same entries twice.

Written by the indexing model from the issue text.