Set of commands in `commands.py` should be limited to actual commands

[sglavoie]

Acceptance

• commands.py contains only basic commands such as summarize and check_score_accuracy so it's easy to read.

Tasks

• Rename check_score_accuracy_all_modules to check_score_accuracy and update tests accordingly.
• Move check_score_accuracy_module into utils/commands_helpers.py. Update code and tests as necessary.