Changes to List withdrawable positions

the endpoint scheme security internalProjectBearer was added to the API

the endpoint scheme security tenantApiKey was added to the API

the header request parameter x-api-key became optional

added the non-success response with the status 401

added the optional property code to the response with the 400 status

added the optional property code to the response with the 403 status

added the optional property code to the response with the 503 status

added the new outside_session_scope enum value to the positions/items/constraints/items response property for the response status 200

added the non-success response with the status 503

endpoint added