Include state medicaid eligibility for undocumented immigrants which applies only to certain age groups

[2021 reference
](https://files.kff.org/attachment/Table-3-State-Adoption-of-Options-to-Cover-Immigrant-Populations-January-2021.pdf)

[2022 reference](https://files.kff.org/attachment/Table-3-Medicaid-and-CHIP-Eligibility-and-Enrollment-Policies-as-of-January-2022.pdf)

We currently only include states that provide full medicaid coverage for undocumented immigrants, regardless of age. However there are additional state rules which include immigrants of a certain age group.

No files or tests are named. Start by locating the current state-level rules for full Medicaid coverage of undocumented immigrants and compare them with the linked 2021 and 2022 references; done means the applicable age groups and states are represented and covered by tests.

Written by the indexing model from the issue text.