Describe the feature

Upstream has updated to latest annotate_snippets version:

https://github.com/rust-lang/rust/blob/4146079cee94242771864147e32fb5d9adbd34f8/compiler/rustc_errors/src/annotate_snippet_emitter_writer.rs

Before, it was heavily outdated so I wrote the rust-like diagnostic -> annotate_snippets conversion myself, but this has a few subtle bugs and might not have the best output.

Our diagnostics are mostly the same as in Rust, so we should be able to replace this conversion to the one that is now in Rust upstream without too much issue.

Additional context

No response