Merge request approvals API endpoint does not show top-level group inherited settings

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There are 2 ways of setting merge request approval settings:

1. on the project level
2. on the top-level group

Both have an api endpoint to check the settings (https://docs.gitlab.com/ee/api/merge_request_approvals.html), the top-level group endpoint still being experimental as of now.

Expected result:

When a user sets the setting on the top-level group, the expectation is that on the project-level API endpoint, you could see the inherited settings, because in reality, these settings apply to the project.

Current result:

The project-level api endpoint does not show that merge request approval settings have been enabled if these settings were only enabled on the top level group.

Steps to reproduce:

1. enable merge request approval settings (https://docs.gitlab.com/ee/user/project/merge_requests/approvals/) only on a top-level group
2. use the project api endpoint to see that these settings are not reflected (https://docs.gitlab.com/ee/api/merge_request_approvals.html)