sessiontxn/staleread: more accurate stale ts (#44272)#44281

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ti-chi-bot[bot] merged 2 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-44272-to-release-6.5

May 30, 2023

+88-5

Commits on May 30, 2023

This is an automated cherry-pick of pingcap#44272

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