Need an API to transfer subgroups to a different parent group
### Problem to solve Make an API available to move subgroups to different parent group. ### Further details The feature to move a subgroup to a different parent is only available through the UI. It would be extremely helpful to manage that through API ### Proposal Make a group transfer API available which honors appropriate gitlab permission of group owner (or maintainer?) which could be used to move/transfer subgroups to a different parent group. ### What does success look like, and how can we measure that? API being available in future release of gitlab ### Links / references Support ticket : https://support.gitlab.com/hc/en-us/requests/102525
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