ckihook crashes when it finds a checkout that did not reach DataWarehouse.
In general, there's no reason why a pipeline wouldn't hit DW, so it usually makes sense to retry the message.
But in this case, the pipelines had failed too early, and they would never hit DW, unless someone retried the jobs manually.

AC:

• Catch the error, check the status of the `merge` job. Cover the corner case of a runner_system_failure with exhausted retries. Possibly *logging* the error, without raising it, with a message suggesting someone to retry the job manually

Jira: CKI-6948(https://issues.redhat.com/browse/CKI-6948)