Add legacy report rerun support

[anth-volk]

Fixes #3391

Summary

This draft adds legacy rerun support for reports in policyengine-api.

It includes:

• explicit reset helpers for report_outputs and simulations
• broader reform_impact cache deletion support for rerun invalidation
• POST /<country_id>/report/<report_id>/rerun
• route coverage for household, economy, and malformed-linkage rerun cases

Notes

• economy cache invalidation uses the current legacy app-path assumptions:
  • dataset = "default"
  • options_hash = "[]"
  • time_period = report.year
• malformed linked-simulation state returns a controlled error before any reset work runs

Testing

FLASK_DEBUG=1 uv run pytest --confcutdir=tests/unit \
  tests/unit/routes/test_report_output_routes.py \
  tests/unit/services/test_report_output_service.py \
  tests/unit/services/test_simulation_service.py \
  tests/unit/services/test_reform_impacts_service.py

[codecov]

Codecov Report

❌ Patch coverage is 78.60082% with 104 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.67%. Comparing base (6af28d7) to head (79a89b3).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
policyengine_api/services/economy_service.py	73.55%	38 Missing and 35 partials ⚠️
...olicyengine_api/services/reform_impacts_service.py	79.22%	13 Missing and 3 partials ⚠️
policyengine_api/routes/economy_routes.py	85.36%	3 Missing and 3 partials ⚠️
policyengine_api/api.py	40.00%	2 Missing and 1 partial ⚠️
policyengine_api/data/data.py	62.50%	3 Missing ⚠️
policyengine_api/services/report_output_service.py	85.71%	1 Missing and 1 partial ⚠️
policyengine_api/country.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3392      +/-   ##
==========================================
+ Coverage   72.20%   73.67%   +1.47%     
==========================================
  Files          56       56              
  Lines        2425     2910     +485     
  Branches      423      529     +106     
==========================================
+ Hits         1751     2144     +393     
- Misses        595      645      +50     
- Partials       79      121      +42     

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