Ability for Self-managed add on eligible users sort by name/activity

What does this MR do and why?

This MR adds the ability for customers to sort add_on eligible users based on Name or Last activity under http://localhost:3000/admin/code_suggestions. This is a sibling implementation to the SaaS version here: Ability for SaaS add on eligible users sort opt... (!165162 - merged)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

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Sort	Results
NAME_ASC
NAME_DESC
LAST_ACTIVITY_ON_ASC
LAST_ACTIVITY_ON_DESC

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 for Self-managed (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, expires_on: 21.month.from_now, quantity: 5, purchase_xid: 'A-S0002')
3. Visit admin section's Duo area http://localhost:3000/admin/code_suggestions

Database Review

SQL 1 name_asc

SELECT
  "users".*
FROM
  "users"
WHERE ("users"."state" IN ('active'))
  AND "users"."user_type" IN (0, 6, 4, 13)
  AND "users"."user_type" IN (0, 4, 5, 15, 17)
  AND "users"."user_type" IN (0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
ORDER BY
  LOWER("users"."name") ASC

SQL 2 name_desc

SELECT
  "users".*
FROM
  "users"
WHERE ("users"."state" IN ('active'))
  AND "users"."user_type" IN (0, 6, 4, 13)
  AND "users"."user_type" IN (0, 4, 5, 15, 17)
  AND "users"."user_type" IN (0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
ORDER BY
  LOWER("users"."name") DESC

SQL 3 last_activity_on_asc

SELECT
  "users".*
FROM
  "users"
WHERE ("users"."state" IN ('active'))
  AND "users"."user_type" IN (0, 6, 4, 13)
  AND "users"."user_type" IN (0, 4, 5, 15, 17)
  AND "users"."user_type" IN (0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
ORDER BY
  "users"."last_activity_on" ASC NULLS FIRST,
  "users"."id" DESC

SQL 4 last_activity_on_desc

SELECT
  "users".*
FROM
  "users"
WHERE ("users"."state" IN ('active'))
  AND "users"."user_type" IN (0, 6, 4, 13)
  AND "users"."user_type" IN (0, 4, 5, 15, 17)
  AND "users"."user_type" IN (0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
ORDER BY
  "users"."last_activity_on" DESC NULLS LAST,
  "users"."id" ASC

Related to #480865 and https://gitlab.com/gitlab-org/gitlab/-/issues/480856