Remove all allows for diagnostic_outside_of_impl and untranslatable_diagnostic throughout the codebase

This PR was mostly made by search&replacing

clippy_config/src/lib.rs

@@ -9,8 +9,6 @@
 #![allow(
     clippy::must_use_candidate,
     clippy::missing_panics_doc,
-    rustc::diagnostic_outside_of_impl,
-    rustc::untranslatable_diagnostic
 )]
 #![deny(clippy::derive_deserialize_allowing_unknown)]
 

clippy_lints/src/lib.rs

@@ -14,8 +14,6 @@
 #![allow(
     clippy::missing_docs_in_private_items,
     clippy::must_use_candidate,
-    rustc::diagnostic_outside_of_impl,
-    rustc::untranslatable_diagnostic,
     clippy::literal_string_with_formatting_args
 )]
 #![warn(

clippy_lints_internal/src/lib.rs

@@ -3,8 +3,6 @@
     clippy::missing_docs_in_private_items,
     clippy::must_use_candidate,
     clippy::symbol_as_str,
-    rustc::diagnostic_outside_of_impl,
-    rustc::untranslatable_diagnostic
 )]
 #![warn(
     trivial_casts,

clippy_utils/src/lib.rs

@@ -11,8 +11,6 @@
     clippy::missing_errors_doc,
     clippy::missing_panics_doc,
     clippy::must_use_candidate,
-    rustc::diagnostic_outside_of_impl,
-    rustc::untranslatable_diagnostic
 )]
 #![warn(
     trivial_casts,

src/driver.rs

@@ -1,5 +1,3 @@
-#![allow(rustc::diagnostic_outside_of_impl)]
-#![allow(rustc::untranslatable_diagnostic)]
 #![feature(rustc_private)]
 // warn on lints, that are included in `rust-lang/rust`s bootstrap
 #![warn(rust_2018_idioms, unused_lifetimes)]