Consider creating cron job to run offline RAVEN search to validate online results

Currently we run the online RAVEN search within GWCelery, which had at least 5 times during O4a+O4b where a search was not run. This is very difficult to diagnose long after the fact and could result in missing out on coincidences in real time.

To help with this, we could periodically (daily?) run a cron job that does a similar search since the last time the job was run. This offline search script already exists in the ligo-raven repository. The results could then be double-checked with what exists in GraceDB, raising an error if there is a difference.