Service Desk FE updates v1

What does this MR do?

• Restores 3 lost commits that disappeared in the rebase/merge, https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1519#note_27045717
  • Latest version missing changes: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1519/diffs?diff_id=3786593
  • Previous version has all changes: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1519/diffs?diff_id=3776491
• Address review from @jschatz1
  • https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1519#note_27046485
  • https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1519#note_27046369

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together