ddl: decouple job scheduler from 'ddl' and make it run/exit as owner changes (#53548)#54662

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ti-chi-bot wants to merge 1 commit intopingcap:release-7.5from ti-chi-bot:cherry-pick-53548-to-release-7.5

+2,479-191

Commits on Jul 16, 2024

This is an automated cherry-pick of pingcap#53548

D3Hunter
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