statistics: avoid oom when to gc large stats_history (#48430)#48488

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ti-chi-bot wants to merge 1 commit intopingcap:release-6.5from ti-chi-bot:cherry-pick-48430-to-release-6.5

+822

Commits on Nov 9, 2023

This is an automated cherry-pick of pingcap#48430

hawkingrei
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