doc: batch processing overview and pipelined dml (#19021)#19505

Merged

ti-chi-bot[bot] merged 2 commits intopingcap:release-8.5from ti-chi-bot:cherry-pick-19021-to-release-8.5

Jan 9, 2025

+248-12

Commits on Jan 8, 2025

This is an automated cherry-pick of pingcap#19021

ekexium
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ti-chi-bot
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fix conflict
ekexium
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