Add pytest CI workflow

[emilyxzhou]

I added a workflow that runs pytest in the vision-interaction directory. These are the changes that were needed:

• Modified the directory structure in vision-project to solve the path issues and changed the corresponding import statements
• Removed unnecessary imports
• Removed hardcoded paths and used relative paths from the scripts requiring those files
• Removed the call to json.load() in the pytest config file to avoid the action's execute permission error