lightning: generate and send region job more smoothly (#42780)#43035

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ti-chi-bot wants to merge 1 commit intopingcap:release-7.0from ti-chi-bot:cherry-pick-42780-to-release-7.0

+1,078-312

Commits on Apr 13, 2023

This is an automated cherry-pick of pingcap#42780

lance6716
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