ddl: fix cancel drop index error #8504
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What problem does this PR solve?
releate PR #8171
This PR make cancel drop index work correctly. Old tidb version cancel drop index may cause the index states neither on
StatePublicnorStateNone. For client, the index is not visible, but client add index with the same name will fail because the name of 'xxx' index is already exists.What is changed and how it works?
We can only cancel drop index job when the index state is on
StatePublicorStateWriteOnly, otherwise, cancel index and make the index state rollback to public may cause data consistency.Check List
Tests
Code changes
Side effects
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This change is