Auto merge of #89755 - jkugelman:must-use-conversions-that-move-self, r=joshtriplett

Add #[must_use] to conversions that move self

Everything here got the same message. Is the wording okay?

```rust
#[must_use = "`self` will be dropped if the result is not used"]
```

I want to draw attention to these methods in particular:

```rust
alloc::sync::Arc<MaybeUninit<T>>     unsafe fn assume_init(self) -> Arc<T>;
alloc::sync::Arc<[MaybeUninit<T>]>   unsafe fn assume_init(self) -> Arc<[T]>;
core::pin::Pin<&'a mut T>            const fn into_ref(self) -> Pin<&'a T>;
core::pin::Pin<&'a mut T>            const fn get_mut(self) -> &'a mut T;
core::pin::Pin<&'a mut T>            const unsafe fn get_unchecked_mut(self) -> &'a mut T;
core::pin::Pin<&'a mut T>            unsafe fn map_unchecked_mut(self, func: F) -> Pin<&'a mut U>;
core::pin::Pin<&'a mut Pin<P>>       fn as_deref_mut(self) -> Pin<&'a mut P::Target>;
```

Parent issue: #89692

r? `@joshtriplett`

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