Changes to List webhooks

endpoint added

api path removed without deprecation

the response property items/active became nullable for the status 200

the response property items/created_at became nullable for the status 200

the response property items/id_project became nullable for the status 200

the response property items/id_webhook_endpoint became nullable for the status 200

the response property items/scope became nullable for the status 200

the response property items/secret became nullable for the status 200

the response property items/url became nullable for the status 200

the response property items/endpoint_description became nullable for the status 200

the response property items/last_update became nullable for the status 200

endpoint added