DEV: Fix flaky test (#25935)

Returned results are ordered by ID, but the fabricated category and
private_category IDs are not always generated in the same order. This
caused the expected and actual results to be in different orders.

spec/requests/hashtags_controller_spec.rb

@@ -88,9 +88,7 @@ RSpec.describe HashtagsController do
           get "/hashtags/by-ids.json", params: { category: [category.id, private_category.id, -1] }
 
           expect(response.status).to eq(200)
-          expect(response.parsed_body).to eq(
-            {
-              "category" => [
+          expect(response.parsed_body["category"]).to contain_exactly(
             {
               "relative_url" => category.url,
               "text" => category.name,
@@ -113,8 +111,6 @@ RSpec.describe HashtagsController do
               "slug" => private_category.slug,
               "id" => private_category.id,
             },
-              ],
-            },
           )
         end
       end