fix(lsp): Remove client-facing format failure warning (denoland#23196)

Fixes denoland#23163.

The client-facing warning doesn't provide any value and is super
annoying. We still emit a warning message on the server side for format
errors, which should fulfill the same (less intrusive) purpose.

cli/lsp/language_server.rs

@@ -1576,7 +1576,6 @@ impl Inner {
         Ok(Some(text_edits))
       }
     } else {
-      self.client.show_message(MessageType::WARNING, format!("Unable to format \"{specifier}\". Likely due to unrecoverable syntax errors in the file."));
       Ok(None)
     }
   }