Add bounded `unnest` + ordered `array_agg` reproducer benchmark and SLT coverage#22075

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kosiew wants to merge 2 commits intoapache:mainfrom

kosiew:memory_issue-01-20788

Commits on May 8, 2026

feat: add synthetic test and benchmark for unnest_array_agg functionality
kosiew
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feat(benchmark): update default expanded rows from 2,000,000 to 10,000
kosiew
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