Use 2024 Medicaid facts for US fiscal refresh

[daphnehanse11]

Summary

• activate the December 2024 CMS Medicaid enrollment package for the 2024 US fiscal refresh
• move the rolling/latest Medicaid package to reviewed exclusions for this release profile
• add a regression test that the fiscal refresh uses target-period Medicaid facts

Fixes #91.

Tests

• uv run pytest packages/populace-build/tests/test_us_fiscal_refresh_builder.py::test_reviewed_exclusions_are_exact_for_fiscal_refresh packages/populace-build/tests/test_us_fiscal_refresh_builder.py::test_fiscal_refresh_uses_target_period_medicaid_source packages/populace-build/tests/test_us_fiscal_refresh_builder.py::test_reviewed_exclusions_fail_when_hard_target_surface_changes -q
• uv run pytest packages/populace-build/tests/test_us_source_coverage.py packages/populace-build/tests/test_us_fiscal_refresh_builder.py::test_reviewed_exclusions_are_exact_for_fiscal_refresh packages/populace-build/tests/test_us_fiscal_refresh_builder.py::test_fiscal_refresh_uses_target_period_medicaid_source -q