LG-5193: Allow supported international phone numbers for IAL2 hybrid flow

[aduth]

Why: So that a user with an international phone number can complete the proofing process, since address verification can be completed via mailed code.

[zachmargolis]

Definitely out of scope for this PR, but since we're in this area, I'd love for us to see if we can pick back up using an option to use a QR code for this handoff, old JIRA https://cm-jira.usa.gov/browse/LG-2854

[aduth]

Definitely out of scope for this PR, but since we're in this area, I'd love for us to see if we can pick back up using an option to use a QR code for this handoff, old JIRA https://cm-jira.usa.gov/browse/LG-2854

Yeah, I can't see me getting to it as part of this work, but I'll surface with the team to see if we could prioritize this, since I agree it could make the flow simpler, and also give some users an option to proof with their phone who might not otherwise have the ability (no cell service, country which can't receive SMS, etc).

[aduth]

I noticed we don't show error messages for form validation issues on the IAL2 phone step, which I tracked as a bug at LG-5225. I did verify with binding.pry that the failure is a result of "Invalid phone number. Please make sure you enter a phone number with a U.S. country code.".

[zachmargolis]

LGTM

[zachmargolis]

I would consider moving the default value to the args:

Suggested change

	def initialize(user:, previous_params:, allowed_countries: nil, delivery_methods: nil)
	previous_params ||= {}
	@user = user
	@allowed_countries = allowed_countries
	@delivery_methods = delivery_methods || ALL_DELIVERY_METHODS
	def initialize(user:, previous_params:, allowed_countries: ALL_DELIVERY_METHODS, delivery_methods: nil)
	previous_params ||= {}
	@user = user
	@allowed_countries = allowed_countries
	@delivery_methods = delivery_methods

[aduth]

Yeah, makes sense. Admittedly I'd considered this, then out of convenience (read: laziness) for test stubbing opted to move the defaulting to the body. In retrospect, I agree it's better as a default argument.