Rollup merge of #100735 - Facel3ss1:ty-utils-translation, r=davidtwco

Migrate `rustc_ty_utils` to `SessionDiagnostic`

I have migrated the `rustc_ty_utils` crate to use `SessionDiagnostic`, motivated by the [recent blog post about the diagnostic translation effort](https://blog.rust-lang.org/inside-rust/2022/08/16/diagnostic-effort.html).

This is my first PR to the Rust repository, so if I have missed anything, or anything needs to be changed, please let me know! 😄

`@rustbot` label +A-translation

compiler/rustc_error_messages/src/lib.rs

@@ -45,6 +45,7 @@ fluent_messages! {
     plugin_impl => "../locales/en-US/plugin_impl.ftl",
     privacy => "../locales/en-US/privacy.ftl",
     save_analysis => "../locales/en-US/save_analysis.ftl",
+    ty_utils => "../locales/en-US/ty_utils.ftl",
     typeck => "../locales/en-US/typeck.ftl",
 }