Auto merge of #111567 - Urgau:uplift_cast_ref_to_mut, r=b-naber

Uplift `clippy::cast_ref_to_mut` lint

This PR aims at uplifting the `clippy::cast_ref_to_mut` lint into rustc.

## `cast_ref_to_mut`

(deny-by-default)

The `cast_ref_to_mut` lint checks for casts of `&T` to `&mut T` without using interior mutability.

### Example

```rust,compile_fail
fn x(r: &i32) {
    unsafe {
        *(r as *const i32 as *mut i32) += 1;
    }
}
```

### Explanation

Casting `&T` to `&mut T` without interior mutability is undefined behavior, as it's a violation of Rust reference aliasing requirements.

-----

Mostly followed the instructions for uplifting a clippy lint described here: https://github.com/rust-lang/rust/pull/99696#pullrequestreview-1134072751

`@rustbot` label: +I-lang-nominated
r? compiler

-----

For Clippy:

changelog: Moves: Uplifted `clippy::cast_ref_to_mut` into rustc

compiler/rustc_span/src/symbol.rs

@@ -1146,6 +1146,8 @@ symbols! {
         profiler_builtins,
         profiler_runtime,
         ptr,
+        ptr_cast_mut,
+        ptr_from_ref,
         ptr_guaranteed_cmp,
         ptr_mask,
         ptr_null,