Prefer `vec.truncate(x)` over `vec.drain(x..)`

### What it does

Suggest to replace `vec.drain(x..)` to `vec.truncate(x)` since it is simpler and cleaner.

### Advantage

- It is shorter and cleaner

### Drawbacks

_No response_

### Example

```rust
fn main() {
    let mut x = vec![1, 2, 3, 4, 5, 6];
    x.drain(1..);
}
```

Could be written as:

```rust
fn main() {
    let mut x = vec![1, 2, 3, 4, 5, 6];
    x.truncate(1);
}
```
