statistics/handle: refine the condition of dumping stats delta (#41133)#41170

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ti-chi-bot wants to merge 1 commit intopingcap:release-5.4from ti-chi-bot:cherry-pick-41133-to-release-5.4

+359-5

Commits on Feb 7, 2023

This is an automated cherry-pick of pingcap#41133

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