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