Select environment for project created with template if no new venv creation

For users going through the Create project from template flow and dont create a new virtual environment, it might make sense to allow them to select the environment they want to use for it is there are venvs or multiple global pythons installed

Trace the Create project from template flow, focusing on the path where the user chooses not to create a new virtual environment. Identify how available environments and global Python installations are discovered. Done means that path lets the user select an existing environment before the project is created.

Written by the indexing model from the issue text.