fix(测试跟踪): 公共用例库中批量选择公共用例库复制到模块失败。

--bug=1008901 --user=王孝刚 【公共用例库】-批量选择公共用例库复制到模块失败。
https://www.tapd.cn/55049933/s/1081614

backend/src/main/java/io/metersphere/track/service/TestCaseService.java

@@ -1339,11 +1339,8 @@ public class TestCaseService {
             batchCopy.setId(UUID.randomUUID().toString());
             batchCopy.setCreateTime(System.currentTimeMillis());
             batchCopy.setUpdateTime(System.currentTimeMillis());
-            checkTestCustomNum(batchCopy);
             batchCopy.setNum(getNextNum(SessionUtils.getCurrentProjectId()));
-            if (StringUtils.isBlank(batchCopy.getCustomNum())) {
             batchCopy.setCustomNum(batchCopy.getNum().toString());
-            }
             batchCopy.setCreateUser(SessionUtils.getUserId());
             batchCopy.setMaintainer(SessionUtils.getUserId());
             batchCopy.setReviewStatus(TestCaseReviewStatus.Prepare.name());