Remove all allows for diagnostic_outside_of_impl and untranslatable_diagnostic throughout the codebase

This PR was mostly made by search&replacing

compiler/rustc_resolve/src/lib.rs

@@ -8,8 +8,6 @@
 
 // tidy-alphabetical-start
 #![allow(internal_features)]
-#![allow(rustc::diagnostic_outside_of_impl)]
-#![allow(rustc::untranslatable_diagnostic)]
 #![feature(arbitrary_self_types)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]

compiler/rustc_resolve/src/macros.rs

@@ -1138,7 +1138,6 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                     errors::OutOfScopeMacroCalls {
                         span: path.span,
                         path: pprust::path_to_string(path),
-                        // FIXME: Make this translatable.
                         location,
                     },
                 );