Allow too many arguments (#26375)

This is nearly half of our #allows, and seems like something we happily
break whenever we need

Release Notes:

- N/A

crates/assistant_context_editor/src/slash_command.rs

@@ -134,7 +134,6 @@ impl SlashCommandCompletionProvider {
         })
     }
 
-    #[allow(clippy::too_many_arguments)]
     fn complete_command_argument(
         &self,
         command_name: &str,