This change introuduces new policies around setting
“default branch protection” in groups.

Namely:

`create_group_with_default_branch_protection `:
this permission determines whether a user can specify the value
of `default_branch_protection` when creating a new group.

`update_default_branch_protection `: this permission determines
whether a user can update the value of `default_branch_protection`
of a group.