invalid index hint to choose a multi-value index don't throw any warnings

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```
CREATE TABLE customers (
id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
name CHAR(10),
custinfo JSON,
UNIQUE INDEX zips( (CAST(custinfo->'$.zipcode' AS UNSIGNED ARRAY)))
);

select * from customer use index(zips);
```

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

SQL executes successfully, but a warning is displayed indicating that the hint is not operable.

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

It executes successfully, without any warning.

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

current master.