Port from CE: The API isn't using the appropriate services for managing forks
What does this MR do?
Ported from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15709 Modifies fork endpoints to use current fork services
Why was this MR needed?
Because the endpoints are not using the current services and don't use the ForkNetworkMember
relationships
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by Backend
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together -
Internationalization required/considered -
If paid feature, have we considered GitLab.com plan and how it works for groups and is there a design for promoting it to users who aren't on the correct plan