Workflow should fail if the REST API does not return `HTTP 200 OK`

[jo-elimu]

Description

Example here: https://github.com/elimu-ai/ml-event-simulator/actions/runs/11235196166/job/31232630791

If the REST API returns an error response, the workflow job should also fail.

Why?

If the workflow fails whenever there is a problem with the REST API, we will get notified about errors more quickly.