Create index doesn't rename the old index that has same columns as the new one

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```sql
CREATE TABLE A (
id int primary key,
foo int not null
);

CREATE TABLE B (
id int primary key
);

ALTER TABLE A ADD CONSTRAINT fk_1 FOREIGN KEY (foo) REFERENCES B(id) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE A ADD CONSTRAINT fk_2 FOREIGN KEY (foo) REFERENCES B(id) ON DELETE RESTRICT ON UPDATE RESTRICT;
```

### 2. What did you expect to see? (Required)

The first index name `fk_1` has been renamed to `fk_2`.

```
mysql> show create table A\G
*************************** 1. row ***************************
Table: A
Create Table: CREATE TABLE `A` (
`id` int(11) NOT NULL,
`foo` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `fk_2` (`foo`),
CONSTRAINT `fk_1` FOREIGN KEY (`foo`) REFERENCES `B` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `fk_2` FOREIGN KEY (`foo`) REFERENCES `B` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.01 sec)
```

### 3. What did you see instead (Required)

The first index name `fk_1` remains unchanged.

```
tidb> show create table A\G
*************************** 1. row ***************************
Table: A
Create Table: CREATE TABLE `A` (
`id` int(11) NOT NULL,
`foo` int(11) NOT NULL,
PRIMARY KEY (`id`) /*T![clustered_index] CLUSTERED */,
KEY `fk_1` (`foo`),
CONSTRAINT `fk_1` FOREIGN KEY (`foo`) REFERENCES `multiple_foreign_key_constraints_are_taken_always_in_the_same_or`.`B` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `fk_2` FOREIGN KEY (`foo`) REFERENCES `multiple_foreign_key_constraints_are_taken_always_in_the_same_or`.`B` (`id`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin
1 row in set (0.01 sec)
```

### 4. What is your TiDB version? (Required)

```
mysql> select tidb_version()\G
*************************** 1. row ***************************
tidb_version(): Release Version: v7.0.0
Edition: Community
Git Commit Hash: 7376954cd868dbc44fc3015c9ef89c53749339a7
Git Branch: heads/refs/tags/v7.0.0
UTC Build Time: 2023-03-29 13:22:40
GoVersion: go1.20.2
Race Enabled: false
TiKV Min Version: 6.2.0-alpha
Check Table Before Drop: false
Store: tikv
1 row in set (0.00 sec)
```