Improve spec coverage for collection of workers/ classes (#27874)

spec/fabricators/account_deletion_request_fabricator.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+Fabricator(:account_deletion_request) do
+  account
+end

spec/fabricators/import_fabricator.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+Fabricator(:import) do
+  account
+  type :following
+  data { attachment_fixture('imports.txt') }
+end