br/pkg/streamhelper: stabilize flaky TestSubBasic#67859

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flaky-claw wants to merge 2 commits intopingcap:masterfrom

flaky-claw:flakyfixer/case_900c57431749-a6

Commits on Apr 17, 2026

fix: stabilize flaky issue #67839
flaky-claw
committed

Commits on Apr 27, 2026

fix: stabilize flaky issue #67839
flaky-claw
committed