Add tests for anonymous access to API
Part of: #2346 (closed)
Context: https://gitlab.com/gitlab-org/gitter/webapp/merge_requests/1652#note_245516196
The MR has 2 commits
- Refactor current fixture setup to ES
- Introduce the ability to setup an anonymous token.
Edited by Tomas Vik (OOO back on 2024-05-09)