test(cart): fix factory partial types #613

Job	Run time
Compute Packages to Test	45s
Build (16.x)	1m 29s
Publish	0s
Test (@daffodil/demo, 16.x)	1m 45s
Test (@daffodil/authorizenet, 16.x)	1m 16s
Test (@daffodil/cart, 16.x)	1m 29s
Test (@daffodil/cart-customer, 16.x)	1m 20s
Test (@daffodil/cart-store-credit, 16.x)	1m 22s
Test (@daffodil/checkout, 16.x)	1m 32s
Test (@daffodil/customer-order, 16.x)	1m 19s
Test (@daffodil/customer-payment-authorizenet, 16.x)	1m 28s
Test (@daffodil/customer-store-credit, 16.x)	1m 21s
Test (@daffodil/order, 16.x)	1m 42s
Test (@daffodil/paypal, 16.x)	1m 32s
Deploy Daff.io / Next	0s
Deploy Daff.io / Production	0s
	18m 20s

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