Add diagnostic translation lints to crates that don't emit them

compiler/rustc_parse_format/src/lib.rs

@@ -9,6 +9,8 @@
     html_playground_url = "https://play.rust-lang.org/",
     test(attr(deny(warnings)))
 )]
+#![deny(rustc::untranslatable_diagnostic)]
+#![deny(rustc::diagnostic_outside_of_impl)]
 // We want to be able to build this crate with a stable compiler, so no
 // `#![feature]` attributes should be added.