We are loading the badge for each included tag in the
Search::TagSerializer and seeing warnings from bullet
```
Bullet::Notification::UnoptimizedQueryError:
GET /search/tags?name=ta
USE eager loading detected
Tag => [:badge]
Add to your query: .includes([:badge])
Call stack
/home/travis/build/forem/forem/app/serializers/search/tag_serializer.rb:5:in `block in <class:TagSerializer>'
/home/travis/build/forem/forem/app/services/search/tag.rb:11:in `serialize'
/home/travis/build/forem/forem/app/services/search/tag.rb:7:in `search_documents'
/home/travis/build/forem/forem/app/controllers/search_controller.rb:54:in `tags'
/home/travis/build/forem/forem/app/lib/middlewares/set_time_zone.rb:10:in `call'
```
Follow the advice, now when multiple tags are in the result set,
having multiple badges, badges are loaded only once (at query time)
and not one by one (at serialization time).
f90459d163