Changes to List simulations for campaign

added the new ATTACHMENT_OPENED enum value to the simulations/items/scenarios/items/attack_vector response property for the response status 200

added the new QR_CODE_SCANNED enum value to the simulations/items/scenarios/items/attack_vector response property for the response status 200

removed the INBOUND_PHONE_CALL enum value from the simulations/items/scenarios/items/channel response property for the response status 200

the response property page_after became nullable for the status 200

the response property simulations/items/end_date became nullable for the status 200

the response property simulations/items/scenarios/items/spoof_page_type became nullable for the status 200

the response property simulations/items/start_date became nullable for the status 200