StrongParams Rubocop: Update pagination params usage

Add a RuboCop to enforce the use of StrongParam... (!155661 - merged) introduced a new rubocop.

Many of the violations are of the form paginated_resource.page(params[:page).per(params[:per_page)). We can resolve those by introducing a new pagination_params helper (in ApplicationController or similar).

• Add a helper
• Update controllers
• Validate specs still pass