Approve quick action not functional on core

Summary

The quick action /approve doesn't work for Gitlab Core, even though the (optional) approve functionality is currenlty available in Core. The docs also mention the quick action is only available on Starter: https://docs.gitlab.com/ee/user/project/quick_actions.html

Instead, it is posted as a plain comment (tested on latest, 13.4.4).

Steps to reproduce

Just try to use the quick action /approve in an Core/free installation.

What is the expected correct behavior?

As (optional) approve is available on Core, I would expect the quick action to work as well.