[CI] TestMultiSegmentGPUFilterConcurrency flaky #2736

Summary

TestMultiSegmentGPUFilterConcurrency.filteredSearchesTakeTheMultiPartitionGpuPath intermittently returns one fewer result than expected.

Failures

• Sep 26 nightly
• Oct 2 PR run

Both failures reported:

every filter here leaves far more than topK candidates per segment expected:<24> but was:<23>

The failure recurred on unrelated revisions, suggesting a flaky concurrency, filtering, or result-merging issue.

Expected behavior

The multi-partition GPU path should consistently return all 24 expected results.