feat: Update loading icon spinner
Remove the dependancy on font awesome and make use of css from gitlab-ce application.scss instead.
Update tests and documentation
Needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/20084
Bug fix after testing: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25683
MR where application.scss is updated: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25186
Follow up issue created for number to string refactoring.
Edited by Brandon Labuschagne