The Ponos unit tests have never run in CI

On the latest pipeline on master, the CI logs says Found 1964 tests. and the GitLab test report shows 1964 tests. When I run manage.py test locally, it says Found 2059 tests. and the test-report.xml does include 2059 test cases.

I looked at all the tests listed in the XML reports and noticed that there are zero arkindex.ponos.tests.*. I tested the tests in https://gitlab.com/teklia/arkindex/backend/-/commit/f582f45ec4bc33f3e220ecc69e463de6c8a92a3f and the CI passed.

The test report of the last pipeline before !1902 (merged) was merged shows 1813 tests, and the test report of the first pipeline after the merge shows 1813 tests too. The Ponos tests have never run in CI!