Total number of users not returned

Currently, we are running into a limitation of the GitLab API

For performance reasons, if a query returns more than 10,000 records, GitLab does not return the total_pages or total headers. In this case, total_pages and total will have a value of None.

For more information see: https://docs.gitlab.com/ee/user/gitlab_com/index.html#pagination-response-headers

We need a different implementation to still get access to the total number of users.