Remove orphaned takeup rate parameters from country package

These parameters are now exclusively in policyengine-us-data.
No formula in the country package references them anymore since
all takeup variables use default_value=True.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: MaxGhenis

changelog_entry.yaml

@@ -1,17 +1,16 @@
 - bump: minor
   changes:
     added:
-      - State-specific Medicaid takeup rates (53%-99% range, calibrated vs uniform 93%)
       - Section 1931 deprivation requirement parameter for non-expansion states
       - is_single_parent_household variable for Medicaid deprivation rules
       - Head Start and Early Head Start takeup variables
-      - WIC takeup and nutritional risk draw variables (for deterministic microsim)
       - SSI resource test now uses actual policy logic in individual sim
     changed:
       - Moved all stochastic randomness to data package for deterministic country package
       - is_parent_for_medicaid_nfc now checks Section 1931 deprivation requirements
       - Head Start and Early Head Start benefits now multiply by takeup
-      - WIC would_claim_wic and is_wic_at_nutritional_risk use draw variables instead of random()
+      - WIC would_claim_wic and is_wic_at_nutritional_risk default to True (resolved in data package)
     removed:
       - aca_take_up_seed, snap_take_up_seed, medicaid_take_up_seed variables
       - random() calls from all variable formulas
+      - Takeup rate parameters (now in policyengine-us-data)