Rollup merge of #101049 - JeanCASPAR:remove-span_fatal-from-ast_lowering, r=davidtwco

Remove span fatal from ast lowering

Now the crate `rustc_ast_lowering` is fully migrated to `SessionDiagnostic`.

r? ``@davidtwco``

compiler/rustc_ast_lowering/src/lib.rs

@@ -36,6 +36,8 @@
 #![feature(never_type)]
 #![recursion_limit = "256"]
 #![allow(rustc::potential_query_instability)]
+#![deny(rustc::untranslatable_diagnostic)]
+#![deny(rustc::diagnostic_outside_of_impl)]
 
 #[macro_use]
 extern crate tracing;