test: Add tests case when deltaMergeBySplit + { flushCache | split } occurs simultaneously (#5454)#5485

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ti-chi-bot wants to merge 1 commit intopingcap:release-5.4from ti-chi-bot:cherry-pick-5454-to-release-5.4

+1,690-18

Commits on Jul 27, 2022

This is an automated cherry-pick of pingcap#5454

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