Stabilize const `{slice,array}::from_mut`
This PR stabilizes the following APIs as const stable as of rust `1.83`:
```rs
// core::array
pub const fn from_mut<T>(s: &mut T) -> &mut [T; 1];
// core::slice
pub const fn from_mut<T>(s: &mut T) -> &mut [T];
```
This is made possible by `const_mut_refs` being stabilized (yay).
Tracking issue: #90206
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