Add create account form to the order confirmation

[LTiger14]

After confirming the order, the user lands on the order confirmation page. If the user is a guest, the page should display an account creation from at the top of the regular page as mocked by UX. To create a user, the same API as the regular registration is use (POST /users). The only fields to provide are: guid (the guid field from the order) and password. After the registration the user is should be logged in.

Mocks: https://98qkkl.axshare.com/#g=1&p=d_order_confirmation_2

Note this ticket does not require the fancy password rules verification box from the mocks. This should reuse the password and confirm password from the registration form.

Acceptance criteria

• New section in the order confirmation to create a full user (only if the user is a guest)
• If the user is not a guest the page should remain the same

[hackergil]

Currently there is no OCC endpoint to upgrade the user to a registered user. To be addressed on this ticket

https://jira.hybris.com/browse/RAY-404

/users endpoint can create a new user, but the order won't be linked to it. Proper way to do it is by upgrading the current account to a user account.

[LTiger14]

Got a response from team Stingrays. There is no other endpoint that supports this feature so we can use the deprecated one. This issue is unblocked.

[LTiger14]

To promote the guest user to actual user use: /users data: guid & password as x-www-form-url-encoded

[giancorderoortiz]

Unable to advance to order confirmation. See https://github.com/SAP/cloud-commerce-spartacus-storefront/issues/4458 (Intermittent issue)

[giancorderoortiz]

Styling pending. See https://github.com/SAP/cloud-commerce-spartacus-storefront/issues/4449

[giancorderoortiz]

Functionality confirmed. 🆗 Able to do guest checkout with different addresses.