* Alerting: Fix support for converted Prometheus rules in app-platform apis
Retrieving converted Prometheus retrieval rules was not supported in the app-platform apis and was throwing a 500 error due to the provenance not being handled properly.
Also adds a test to cover converted Prometheus rules when getting rules.
Closes https://github.com/grafana/alerting-squad/issues/1200
* add test to confirm provenance compatibility
