Clarify protected branch role/group/user selection dropdown

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Problem to solve

When creating or editing the setting for a protected branch and choosing options for Allowed to merge and Allowed to push the role/group/user selection dropdown allows a user to select No one and will also allow the selection of additional groups/users. This creates a confusing situation where a user needs to interpret what rule will be enforced. Is it no one, or the selected users? Our UI should be explicit and clear about what impact selections will have.

Proposed solution

Do not allow additional selections of additional users/groups if No one is selected.

Important consideration

We need to account for the impact this change may have on users that have chosen this configuration and determine a way to role out the change without negative impacts.