sessiontxn/staleread: more accurate stale ts (#44272)#45760

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ti-chi-bot[bot] merged 2 commits intopingcap:release-7.1from ti-chi-bot:cherry-pick-44272-to-release-7.1

Aug 17, 2023

+92-9

Commits on Aug 2, 2023

This is an automated cherry-pick of pingcap#44272

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