Fix Idaho OBBBA Schedule 1-A deduction sunset

[MaxGhenis]

Summary

• Move Idaho QBI and federal Schedule 1-A deductions into a periodized Idaho parameter list.
• Remove the temporary OBBBA Schedule 1-A deductions from Idaho beginning in 2029 without zeroing the federal deduction variables.
• Add a 2029 regression test showing federal temporary deductions can still calculate while Idaho excludes them.

Fixes #8295.

Validation

• uv run policyengine-core test policyengine_us/tests/policy/baseline/gov/states/id/tax/income/deductions/id_qualified_business_income_and_federal_schedule_1a_deductions.yaml -c policyengine_us
• uv run ruff check policyengine_us/variables/gov/states/id/tax/income/deductions/id_qualified_business_income_and_federal_schedule_1a_deductions.py
• uv run ruff format --check policyengine_us/variables/gov/states/id/tax/income/deductions/id_qualified_business_income_and_federal_schedule_1a_deductions.py

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (8cb60e7) to head (ab7f49b).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #8299   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         1    -2     
  Lines           63        10   -53     
=========================================
- Hits            63        10   -53     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.