Resolve StrongParams rubocop TODOS for users

• Follow the recommended refactor options in Resolve StrongParams rubocop TODOs (&14255) for these files:
  • 'app/controllers/users/namespace_visits_controller.rb'
  • 'app/controllers/users/terms_controller.rb'
  • 'app/controllers/users/unsubscribes_controller.rb'
• Remove the files from .rubocop_todo/rails/strong_params.yml