Rollup merge of #120693 - nnethercote:invert-diagnostic-lints, r=davidtwco

Invert diagnostic lints.

That is, change `diagnostic_outside_of_impl` and `untranslatable_diagnostic` from `allow` to `deny`, because more than half of the compiler has been converted to use translated diagnostics.

This commit removes more `deny` attributes than it adds `allow` attributes, which proves that this change is warranted.

r? ````@davidtwco````

Author: matthiaskrgr

src/bin/miri.rs

@@ -2,7 +2,9 @@
 #![allow(
     clippy::manual_range_contains,
     clippy::useless_format,
-    clippy::field_reassign_with_default
+    clippy::field_reassign_with_default,
+    rustc::diagnostic_outside_of_impl,
+    rustc::untranslatable_diagnostic,
 )]
 
 extern crate rustc_data_structures;

src/lib.rs

@@ -33,8 +33,10 @@
     clippy::bool_to_int_with_if,
     clippy::box_default,
     clippy::needless_question_mark,
+    rustc::diagnostic_outside_of_impl,
     // We are not implementing queries here so it's fine
-    rustc::potential_query_instability
+    rustc::potential_query_instability,
+    rustc::untranslatable_diagnostic,
 )]
 #![warn(
     rust_2018_idioms,