statistics: add bench for MergeGlobalStatsTopNByConcurrency (#45998)#46032

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ti-chi-bot[bot] merged 2 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-45998-to-release-6.5

Aug 14, 2023

+255-9

Commits on Aug 13, 2023

This is an automated cherry-pick of pingcap#45998

hawkingrei
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Commits on Aug 14, 2023

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