Add confirmation for deleting a spec

[nevendyulgerov]

📄 Context

Currently, all you have to do to delete a spec is click it's delete button and it's gone. Let's add a confirmation modal for this action to prevent cases where users click on the delete button by mistake.

📈 Subtasks

• Add a confirmation that asks the user to confirm the delete action for a spec.
• Cover the new logic with unit (and e2e) tests

🎯 Definition of Done

• Deletion of specs need to be confirmed by users
• All unit tests pass