Allow for a "too complex" eligibility determination.

[trevorshannon]

We currently can determine users to be eligible, ineligible, or unknown for a given program based on their inputs. The unknown category is reserved for "we need more information from you." There could be a fourth category for cases where the user has given all information we've asked for, but we can't make a determination simply due to the complexities of a program's eligibility rules.

As an example, Calfresh applicants generally need gross income under 200% federal poverty level. However, if a household containing an elderly or disabled individual has a gross income above 200% federal poverty level, they could still be eligible depending on their net income. The net income calculation requires a lot of information from the applicant about how much they pay for housing, medicine, etc and is likely too complex for our tool. In this case, we'd like to be able to say something like "you might be eligible, but you need to contact the program administrator"

[trevorshannon]

This is done for immigration status (#368), but still needs to be completed for the example given above.