Revert "Add partial accounts to collections endpoint (#38919)" (#39128)

spec/models/collection_spec.rb

@@ -199,16 +199,4 @@ RSpec.describe Collection do
       expect(subject.to_log_permalink).to eq ActivityPub::TagManager.instance.uri_for(subject)
     end
   end
-
-  describe '#top_items' do
-    let(:collection) { Fabricate(:collection) }
-
-    before do
-      5.times { |i| Fabricate(:collection_item, collection:, position: i + 1) }
-    end
-
-    it 'returns the topmost four items' do
-      expect(collection.top_items.map(&:position)).to contain_exactly(1, 2, 3, 4)
-    end
-  end
 end