Visibility levels not shared for projects and snippets
<!--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> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=13912) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=13912) </details> <!--IssueSummary end--> I think that it'd be useful to have different visibilities for project and snippets. Our use case is that all of out projects are private so I've set the visibility to _only private_ but I don't mind if the users create snippets to share each other. ![Screenshot_from_2015-10-21_13_21_37](/uploads/78a031924f45dcf4eb6fc617d491ce96/Screenshot_from_2015-10-21_13_21_37.png)
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