stabilize maybe_uninit_slice

[bend-n]

Tracking issue: #63569
Closes: #63569
FCP completed: #63569 (comment)

Removes:

pub const fn slice_as_ptr(this: &[MaybeUninit<T>]) -> *const T;
pub const fn slice_as_mut_ptr(this: &mut [MaybeUninit<T>]) -> *mut T;

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