planner: make converge index merge path feel the prefer tiflash hint (#56227)#59072

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ti-chi-bot wants to merge 4 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-56227-to-release-6.5

+36

Commits on Jan 21, 2025

This is an automated cherry-pick of pingcap#56227

AilinKid
authored and
ti-chi-bot
committed

Commits on Feb 5, 2025