[Bug]: confusing error message when load insert into a table with a unique index

[lyukun]

Describe the bug

全量旁路导入，无主键表 设置unique 索引，插入索引列数据重复的数据，报primary key冲突，
Environment

observer (OceanBase 4.3.2.0)
REVISION: 1-23719066af791450c309f6c596abe45716c958a5
BUILD_BRANCH: master
BUILD_TIME: May 9 2024 15:05:09
BUILD_FLAGS: RelWithDebInfo|Sanity
BUILD_INFO: jenkins-oceanbase_build_master_7u_santiy-B4836

Fast Reproduce Steps(Required)

Steps to reproduce the behavior:
无主键表 设置unique 索引，插入索引列数据重复的数据，报primary key冲突，提示信息不精准

Expected behavior

MySQL的报错更准确
MySQL [test]> CREATE TABLE users (
-> id INT AUTO_INCREMENT PRIMARY KEY,
-> email VARCHAR(255) NOT NULL,
-> UNIQUE INDEX (email)
-> );
Query OK, 0 rows affected (0.05 sec)

MySQL [test]> insert into users(email) values ('liugs.lgs');
Query OK, 1 row affected (0.04 sec)

MySQL [test]> insert into users(email) values ('liugs.lgs');
ERROR 1062 (23000): Duplicate entry 'liugs.lgs' for key 'users.email'
Actual Behavior

报 ERROR 1062(23000): Duplicated primary key

Additional context