Re-enable action tests

The [most important tests](https://github.com/actions/ai-inference/blob/main/.github/workflows/ci.yml) are silently passing due to `continue-on-error` flag in the CI workflows

Please get the underlying blocker solved and get this re-enabled asap. 

<img width="1656" height="1094" alt="Image" src="https://github.com/user-attachments/assets/5d3c834b-2467-464f-87f0-d7ccac7b29ef" />