Label Business Pro Lite plans as Business Premium (#40301)

## What changed

- Show `SelfServeBusinessProLite` as `Business Premium` in TUI account displays instead of grouping it under `Business`.
- Update the display-name and app-server session tests for the new label.

GitOrigin-RevId: aac5c7abe9543f5d49f4e9dc9cbe20e7e3b41e5b

codex-rs/tui/src/app_server_session.rs

@@ -3712,7 +3712,7 @@ mod tests {
             Some(StatusAccountDisplay::ChatGpt {
                 email: None,
                 plan: Some(ref plan),
-            }) if plan == "Business"
+            }) if plan == "Business Premium"
         ));
     }
 }