Mirrors R/spending.R:465-466 -- .check_govids_in_scope()'s return was
previously captured only for its message side effect. Also drops a
redundant duplicate assertion in the flow-code guard test.
The bundled fixture has no balance item_code with is_aggregate = TRUE, so
asserting COUNT(*) FROM balance_long WHERE is_aggregate = 0 passed whether
or not the view's AND NOT is_aggregate predicate existed. Follows the
synthetic hive-partitioned parquet pattern already used for the 22-/23-
and 24-/25- view predicates in test-views.R: reads the real
inst/sql/26-balance_long.sql text off disk and executes it against a
synthetic corpus containing both an aggregate and non-aggregate row under
a real balance item_code (W01).
jared