Do not recurse indefinitely while checking for inner mutability

`clippy_utils::ty::InteriorMut::interior_mut_ty_chain` must stop
recursing forever when types are chained indefinitely due to the use of
associated types in generics. A false negative is acceptable, and
documented here.

Should this situation be later identified specifically, a conversion of
`Option` to `Result` would allow separating the infinitely recursive
case from a negative one.

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