Support async transfer on REST API

Shane Maglangitrequested to merge
586549-async-transfer-api-support into master

What does this MR do and why?

Support async transfer on the Group and Project REST APIs, controlled by the groups_and_projects_async_transfer feature flag

References

Related to #586549 (closed)

Screenshots or screen recordings

How to set up and validate locally

  1. Enable the groups_and_projects_async_transfer feature flag
  2. Send POST /api/v4/groups/:id/transfer?group_id=:target_id request to schedule a group transfer.
  3. Send PUT /projects/:id/transfer?namespace=:target_id request to schedule a project transfer.

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Edited by Shane Maglangit

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