tests: Fix RegionBlockReaderTest helper functions (#5899)#5919

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ti-chi-bot wants to merge 1 commit intopingcap:release-4.0from ti-chi-bot:cherry-pick-5899-to-release-4.0

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Commits on Sep 16, 2022

This is an automated cherry-pick of pingcap#5899

JaySon-Huang
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ti-chi-bot
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