ddl: fast reorg of index may cause duplicate entry error
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Description
## Bug Report
Please answer these questions before submitting your issue. Thanks!
### 1. Minimal reproduce step (Required)
### 2. What did you expect to see? (Required)
Look, we did add a unique index with ddl job id as 1131, while at 02.19 ddl owner has changed, and resume the checkpoint at same time, consequently leading duplicate entry error at 02.21
### 3. What did you see instead (Required)
no duplicate error (since user has checked with their data)
### 4. What is your TiDB version? (Required)
master, 7.1.1
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