Testing #19883

I already have a .venv in my project. I was curious what would happen if I went through the Python: Create Environment steps again. I can't tell if anything happened. Should we prompt users if they already have a .venv, allowing them to choose to override it or back out of creating a new .venv and just use the existing one? The Dev Containers extension works similarly: if a user chooses the command to add a dev container config and they already have one, they're asked if they'd like to override or just use the existing one.