In trial sign up flow dynamically ask for state when it's required
## Problem
Currently, in the new trial sign up flow, we do not ask for the state when a user selects a country value of `The United States` or `Canada`. The sales team needs the state value in order for the lead to be rotated correctly.
## Proposed Solution
If someone selects a country value of `United States` or `Canada` then we dynamically display one more required field where they must select their state on this screen.
https://gitlab.com/-/trials/new

issue