Add querySelectorAll workshop to main with steps and tests

Once this is approved, this workshop will need to be added to main repo with steps and tests

https://github.com/freeCodeCamp/CurriculumExpansion/issues/791

It will go just before the favorite icon toggler lab here

<img width="811" alt="Image" src="https://github.com/user-attachments/assets/df46ab9d-23ae-4418-9f54-9b49f8ed7b33" />