Fix schedule time data primary key conflict when importing workflow definition (#13926)

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ProcessDefinitionServiceImpl.java

@@ -1429,6 +1429,7 @@ public class ProcessDefinitionServiceImpl extends BaseServiceImpl implements Pro
         if (null != schedule) {
             ProcessDefinition newProcessDefinition = processDefinitionMapper.queryByCode(processDefinition.getCode());
             schedule.setProcessDefinitionCode(newProcessDefinition.getCode());
+            schedule.setId(null);
             schedule.setUserId(loginUser.getId());
             schedule.setCreateTime(now);
             schedule.setUpdateTime(now);