Fix ev-cli version check if not using venv

[hikinggrass]

Describe your changes

This now uses a global property to store the ev-cli version, the variable used before could sometimes be empty leading to errors. Additionally remove a redundant cmake option

Issue ticket number and link

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [ ] I have made corresponding changes to the documentation
• [x] I read the contribution documentation and made sure that my changes meet its requirements