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````

compiler/rustc_pattern_analysis/src/lib.rs

@@ -1,5 +1,8 @@
 //! Analysis of patterns, notably match exhaustiveness checking.
 
+#![allow(rustc::untranslatable_diagnostic)]
+#![allow(rustc::diagnostic_outside_of_impl)]
+
 pub mod constructor;
 #[cfg(feature = "rustc")]
 pub mod errors;