Allow for server-side confirmPayment

[lukeholder]

Description

Move to a server side method of confirming payment so we can still do the standard order payment total checks.

See https://docs.stripe.com/payments/finalize-payments-on-the-server?platform=web&type=payment#submit-payment

[linear]

COM-452 Allow for server-side confirmPayment

[lukeholder]

This will also solve the issue of providing billing address data from the commerce billing address that does not need to be provided in the payment element.