Add ability to sort add-on eligible user list

What does this MR do and why?

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/426863. This MR adds sorting functionality to the the Code Suggestions User List (SaaS version). (The backend is not yet implemented. Here, we're providing only frontend scaffolding/implementation.)

Note that the feature does not impact current UI, as the FF is disabled.

MR acceptance checklist

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Needs both gdk and CustomersDot running (setup guide)
2. In Rails console, enable Code Suggestions Feature.enable(:hamilton_seat_management)
3. In Rails console, enable the filtering capabilities Feature.enable(:enable_add_on_users_filtering)

To assign Code Suggestions seats to your group:

1. In Rails console, add_on = GitlabSubscriptions::AddOn.find_or_create_by!(name: "code_suggestions") {|e| e.description = "Test"}
2. In Rails console, GitlabSubscriptions::AddOnPurchase.create!(add_on: add_on, namespace: Namespace.find(<you-name-space-id>), expires_on: 21.month.from_now, quantity: 5, purchase_xid: 'A-S0002')
3. Visit any group or project member pages such as http://127.0.0.1:3000/groups/flightjs/-/usage_quotas#code-suggestions-usage-tab