Support custom roles on protected branches

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Proposal

For some customers, not all developers should be able to push and merge to protected branches. Additionally, not all developers should be upgraded to Maintainer. However it can be too cumbersome to manually select individual users to give them granular permissions on a per project level.

We will need a capability to create a custom role, assign to a subset of users in the group hierarchy and use that custom role as an approved role to Push and Merge on a protected branch.

Related customer conversation: https://hello.chorus.ai/listen?guid=ffed32f46f8e44898b692fdf7de85433 (GitLab team member only access)