Remove less relevant info from diagnostic

```
error[E0277]: the trait bound `dep_2_reexport::Type: Trait` is not satisfied because the trait comes from a different crate version
 --> multiple-dep-versions.rs:7:18
  |
7 |     do_something(Type);
  |                  ^^^^ the trait `Trait` is not implemented for `dep_2_reexport::Type`
  |
note: there are multiple different versions of crate `dependency` in the dependency graph
 --> /home/gh-estebank/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-1.rs:4:1
  |
3 | pub struct Type(pub i32);
  | --------------- this type implements the required trait
4 | pub trait Trait {
  | ^^^^^^^^^^^^^^^ this is the required trait
  |
 ::: multiple-dep-versions.rs:1:1
  |
1 | extern crate dep_2_reexport;
  | ---------------------------- one version of crate `dependency` is used here, as a dependency of crate `foo`
2 | extern crate dependency;
  | ------------------------ one version of crate `dependency` is used here, as a direct dependency of the current crate
  |
 ::: /home/gh-estebank/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-2.rs:3:1
  |
3 | pub struct Type;
  | --------------- this type doesn't implement the required trait
4 | pub trait Trait {
  | --------------- this is the found trait
  = note: two types coming from two different versions of the same crate are different types even if they look the same
  = help: you can use `cargo tree` to explore your dependency tree
```

The approach to accomplish this is a HACK, and we'd want a better way to do this. I believe that moving E0277 to be a structured diagnostic would help in that regard.

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