Aggregate impact: another reform's target can withhold a reform's year #2775

withheld_reasons (policyengine_uk/utils/aggregate_impact/measure.py) checks every entry in baseline["targets"], which holds the target of each reform the tool costs. A reform that moves another reform's target in 1 to 9 records therefore loses that year's costing and its own target change, although the report publishes nothing about the other target for that reform.

test_a_small_change_in_another_reforms_target_names_that_target in #2772 builds the case: the tool withholds a reform aimed at income tax because the reform moves Pension Credit in three records.

withheld_reasons already checks gov_balance, which covers the reform's whole costing, so checking the reform's own target beside it would publish these years. That change needs one check first: that no other published figure for the reform reads the other target.

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