message: proc-macros: remove `traced_function`
diff: @@ -55,7 +55,6 @@ pub fn trace(_args: TokenStream, item: TokenStream) -> TokenStream {
  let __tracing_attr_span = span!(
  tracing::Level::TRACE,
  #ident_str,
  - traced_function = &#ident_str,
  #(#param_names = tracing::field::debug(&#param_names_clone)),*
  );
  let __tracing_attr_guard = __tracing_attr_span.enter();
  