Rollup merge of #91022 - compiler-errors:modulo_infer, r=estebank

Suggest `await` in more situations where infer types are involved

Currently we use `TyS::same_type` in diagnostics that suggest adding `.await` to opaque future types.

This change makes the suggestion slightly more general, when we're comparing types like `Result<T, E>` and `Result<_, _>` which happens sometimes in places like `match` patterns or `let` statements with partially-elaborated types.

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Question:
1. Is this change worthwhile? Totally fine if it doesn't make sense adding.
2. Should `same_type_modulo_infer` live in `rustc_infer::infer::error_reporting` or alongside the other method in `rustc_middle::ty::util`?
3. Should we generalize this change? I wanted to change all usages, but I don't want erroneous suggestions when adding `.field_name`...

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