Change all the initial importing to push into the sorted sets

Follow up from #34086 (closed)

1. Change all the initial importing to push into the sorted sets instead of using the sidekiq queues like we currently have. This can be left out of this issue since it's the incremental updates which causes the queues to grow massively and are generally less efficient due to duplicate updates. We should also see if we can put initial indexing into a separate queue but processed with exactly the same logic. This would allow incremental updates to keep processing and not end up being delayed because they happen after a very large queue forms for newly added groups. This could be an optimization later though.