PR - https://github.com/SatelliteQE/robottelo/pull/15783
Airgun PR - https://github.com/SatelliteQE/airgun/pull/1480

The failure occurred because the code was deleting the discovery rule, and then attempting to read from the deleted table using the read_all method. To resolve this issue, I updated the method accordingly.

Updated the read_all() method, which was causing issues for the test. The method and associated views have been revised.