Rollup merge of #106927 - Ezrashaw:e0606-make-machine-applicable, r=estebank

make `CastError::NeedsDeref` create a `MachineApplicable` suggestion

Fixes #106903

Simple impl for the linked issue. I also made some other small changes:
- `CastError::ErrorGuaranteed` now owns an actual `ErrorGuaranteed`. This better enforces the static guarantees of `ErrorGuaranteed`.
- `CastError::NeedDeref` code simplified a bit, we now just suggest the `*`, instead of the whole expression as well.

diff --cc compiler/rustc_hir/src/hir.rs
Simple merge