Downgrade untranslatable_diagnostic and diagnostic_outside_of_impl to allow

See <#132181> for more context.

Author: jieyouxu

compiler/rustc_lint/src/internal.rs

@@ -427,7 +427,7 @@ declare_tool_lint! {
 /// More details on translatable diagnostics can be found
 /// [here](https://rustc-dev-guide.rust-lang.org/diagnostics/translation.html).
 pub rustc::UNTRANSLATABLE_DIAGNOSTIC,
-Deny,
+Allow,
 "prevent creation of diagnostics which cannot be translated",
  report_in_external_macro:true
 }
@@ -440,7 +440,7 @@ declare_tool_lint! {
 /// More details on diagnostics implementations can be found
 /// [here](https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-structs.html).
 pub rustc::DIAGNOSTIC_OUTSIDE_OF_IMPL,
-Deny,
+Allow,
 "prevent diagnostic creation outside of `Diagnostic`/`Subdiagnostic`/`LintDiagnostic` impls",
  report_in_external_macro:true
 }