Additional Snippet edit permission options
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### Problem
As part of https://gitlab.com/gitlab-org/gitlab/-/issues/16256 Snippets inside of projects would be editable by more users of the project. This behavior may not be desirable for all Snippets within a project, or some Snippets in a project may need to have more restricted access.
### Proposal
A new permission option should be added to the Snippet edit screen that allows the permissions to be set to include developer roles.

issue