chore: Enable the new Rubocop rules (#7122)

fixes: https://linear.app/chatwoot/issue/CW-1574/renable-the-disabled-rubocop-rules

spec/configs/schedule_spec.rb

@@ -19,6 +19,6 @@ RSpec.context 'with valid schedule.yml' do
       end
     end
     # ensure that no duplicates exist
-    assert_equal schedule_keys.uniq.count, schedule_keys.count
+    expect(schedule_keys.count).to eq(schedule_keys.uniq.count)
   end
 end