drainer want the ddlhistory to generate ddl after pitr done

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)
1. restore pitr
2. start drainer

### 2. What did you expect to see? (Required)
success
### 3. What did you see instead (Required)
```
[2023/08/14 12:05:07.544 +08:00] [ERROR] [main.go:69] ["start drainer server failed"] [error="handlePreviousDDLJobIfNeed failed: handle ddl job ID:237
29, Type:set tiflash replica, State:synced, SchemaState:public,
```
The workaround is to load table info instead.
### 4. What is your TiDB version? (Required)
master