Use keyset pagination on group list pages

What does this MR do and why?

Use keyset pagination on Your Work > Groups and Explore > Groups page

This fixes a bug where the pagination button disappears due to the offset pagination constraints

References

Related to #591712 (closed)

Screenshots or screen recordings

How to set up and validate locally

1. (Optional) Set the default page size to 1 on config/initializers/kaminari_config.rb. Run gdk restart to apply.
2. Enable groups_list_keyset_pagination feature flag.
3. Go to http://localhost:3000/dashboard/groups (or http://localhost:3000/explore/groups with explore_groups_vue flag enabled)
4. Validate that the pagination works accodingly.

MR acceptance checklist

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