Additional admin default settings for protected branches
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### Problem to solve
Add `No one` being able to push to protected braches in `Default branch protection` in the admin settings.
### Proposal
Expand `Default branch protection` in the admin area -> settings -> Visibility and access controls to include another level of protection that allows `No one` to push to protected branches.
### Links / references
Customer ticket -> https://gitlab.zendesk.com/agent/tickets/99983 (internal use)
/cc @jeremy\_
issue