refactor: unsplit first and last name fields in Checkout saving

[kieckhafer]

Impact: minor
Type: refactor

Issue

The way we save names is a little funky. We have our forms split into firstName and lastName fields, but we save names inside the data as fullName. We do this by combining the firstName and lastName fields inside the starterkit.

Solution

We need to update the form to accept a single fullName field, instead of two fields which are combined into a single field. This update fixes the issue in the starterkits mutation of the data. An update to the component library will also be made to make the fields into a single field.

Breaking changes

I don't expect any breaking changes, as the two fields are combined into the single field anyway on the backend.

Testing

See that fullName data is saved correctly in cart.shippings.address.fullName one the Component library PR is merged.

[nnnnat]

👍