Remove `Group#shared_into_ancestors` scope
https://gitlab.com/gitlab-org/gitlab/-/blob/8fd220fe55dd76f2301d65a20f775dcf9655db32/app/models/group.rb#L267 This scope appears to be superfluous. We have scopes for `:shared_with_groups`, `:shared_with_groups_of_ancestors`, and `:shared_with_groups_of_ancestors_and_self`. There are lots of uses of this scope in the app we need to remove and replace with the correct scope.
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