Testplan for #10281 - service health and readiness checks

We need to test the `/healthz` and `/readyz` of every service mentioned in #10281 for functionality (e2e). Therefore we need additional tests in our PHP-Suite.

IMHO there is no need to test them in k8s or k3s. It should be sufficient to check the output of the two endpoints with their conditions being met or unmet.

refs #8783

Tests:
- [x] check for `/healthz` and `/readyz` for every services: https://github.com/owncloud/ocis/pull/10351
- [ ] during test stop the nats server and start again, check for `/healthz` and `/readyz`
- issue: https://github.com/owncloud/ocis/issues/8783

## Known bugs:
- https://github.com/owncloud/ocis/issues/10661
Note: After this bug has been fixed, merge scenarios separated in this PR https://github.com/owncloud/ocis/pull/10808