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 ![Screen_Shot_2019-10-24_at_3.27.15_PM](/uploads/1501b1421ad98d3c50dc34d6d08d99e3/Screen_Shot_2019-10-24_at_3.27.15_PM.png)
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