ddl: check index key length when convert charset (#56964)#57441

Merged

ti-chi-bot[bot] merged 3 commits intopingcap:release-7.1from ti-chi-bot:cherry-pick-56964-to-release-7.1

Nov 18, 2024

+40

Commits on Nov 18, 2024

This is an automated cherry-pick of pingcap#56964

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remove
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adapt and add test
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