do not normalize `use foo::{self}` to `use foo`

It changes behaviour and can cause collisions. E.g. for the following snippet

```rs
mod foo {

    pub mod bar {}

    pub const bar: i32 = 8;
}

// tranforming the below to `use foo::bar;` causes the error:
//
//   the name `bar` is defined multiple times
use foo::bar::{self};

const bar: u32 = 99;

fn main() {
    let local_bar = bar;
}
```

we still normalize

```rs
use foo::bar;
use foo::bar::{self};
```

to `use foo::bar;` because this cannot cause collisions.

See: https://github.com/rust-lang/rust-analyzer/pull/17140#issuecomment-2079189725

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