client: Hide usage when not available (#38234)

Release Notes:

- N/A

crates/client/src/user.rs

@@ -754,6 +754,10 @@ impl UserStore {
     }
 
     pub fn model_request_usage(&self) -> Option<ModelRequestUsage> {
+        if self.plan().is_some_and(|plan| plan.is_v2()) {
+            return None;
+        }
+
         self.model_request_usage
     }