Borrow suggestion on unmet obligation doesn't account for types in type-relative paths

[estebank]

Code

struct S;
trait Trait {
    fn foo() {}
}
impl Trait for &S {}
impl Trait for &mut S {}
fn main() {
    let _ = S::foo();
}

Current output

error[E0277]: the trait bound `S: Trait` is not satisfied
  --> $DIR/dont-suggest-borrowing-existing-borrow.rs:17:13
   |
LL |     let _ = S::foo();
   |             ^ the trait `Trait` is not implemented for `S`
   |
help: consider borrowing here
   |
LL |     let _ = &S::foo();
   |             +
LL |     let _ = &mut S::foo();
   |             ++++

Desired output

error[E0277]: the trait bound `S: Trait` is not satisfied
  --> $DIR/dont-suggest-borrowing-existing-borrow.rs:17:13
   |
LL |     let _ = S::foo();
   |             ^ the trait `Trait` is not implemented for `S`
   |
help: consider borrowing here
   |
LL |     let _ = <&S>::foo();
   |             ++ +
LL |     let _ = <&mut S>::foo();
   |             +++++  +

Rationale and extra context

No response

Other cases

Rust Version

1.90-dev

Anything else?

This happens because the suggestion code assumes that the obligation always comes from an expression.

Found while working on #132469