Fix flaky test

Events can be any type, and some types can have identical ids. Thus asserting on ids only is brittle. Filtering for work packages and then testing ids fixes the flakiness.

spec/models/activities/fetcher_integration_spec.rb

@@ -206,7 +206,7 @@ describe Activities::Fetcher, 'integration' do
           # project attributes and news only require the user to be member
           expect(subject.map(&:journable_id))
             .to match_array([project.id, subproject.id, news.id, subproject_news.id, work_package.id])
-          expect(subject.map(&:journable_id))
+          expect(subject.filter { |e| e.event_type.starts_with?('work_package') }.map(&:journable_id))
             .not_to include(subproject_work_package.id)
         end
       end