ccTLD registration occasionally fails

See internal ref: pc8HXX-ZF-p2#comment-812 @ point 6

Expected behavior

Country Code Top-Level Domains (ccTLD) are registered error-free, like the common well-known TLDs.

Actual behavior

We're occasionally getting failures when some ccTLD are registered via the app. For example, in the case of Canadian domains (ie. .ca) the failures occur because the 'Canadian presence' field is missing.

.ca example in Calypso

Steps to reproduce the behavior

Note
The idea is to short-circuit the checkout web-view since the domain costs $0, but that’s where we do the contact validation so if we skip it we don’t get the additional data.

1. Register a new account and create a new site
2. Purchase just a plan to your site (without domain)
3. Try to register a domain on that site via the mobile app
4. 💥 Notice there is an error in the internal system

Start by reproducing the ccTLD registration flow through the mobile app, focusing on the checkout web-view short-circuit and contact validation described in the issue. Done means registering a Canadian .ca domain without the missing Canadian presence field causing an internal error.