Disable create-on-push feature for user/group
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=27568) </details> <!--IssueSummary end--> ### Problem to solve Create-on-push has resulted in a number of implicit project creations on my behalf that I've needed to delete. I find the feature less than helpful, personally, because such projects are not linked as forks and then require deleting the generated project by hand. ### Intended users Those who do not want implicit project creation. ### Further details Users won't be confused why their "fork" is not a fork on GitLab. ### Proposal Offer an option to disable implicit project creation for users and groups. ### Permissions and Security The user themselves or the group owners. ### Documentation Notes on the option and possibly screenshots. ### What does success look like, and how can we measure that? A way to disable implicit project creation exists. ### Links / references gitlab-ce#26388
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