refactor: optimize notification and subscription query using index (#5414)

### What type of PR is this?
/kind improvement
/area core
/milestone 2.13.x

### What this PR does / why we need it:
使用索引机制优化通知和订阅查询以提高性能

how to test it
测试通知列表不报错即可

### Does this PR introduce a user-facing change?

```release-note
使用索引机制优化通知和订阅查询以提高性能
```

ui/uc-src/modules/notifications/Notifications.vue

@@ -31,7 +31,7 @@ const {
   queryFn: async () => {
     const { data } = await apiClient.notification.listUserNotifications({
       username: currentUser?.metadata.name as string,
-      unRead: activeTab.value === "unread",
+      fieldSelector: [`spec.unread=${activeTab.value === "unread"}`],
     });
 
     return data;