Improve backup checksum progress granularity
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type/enhancement
- Dominant language
- Go
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Description
## Enhancement
Current backup checksum progress is based on `schemas.Len()` https://github.com/pingcap/tidb/blob/17c0d5481bfca96ab48d21263b8add3489966e3d/br/pkg/task/backup.go#L618
In a single big table scenario. it's not clear to let user know the exact progress for checksum. so it's better to improved
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