Log backend errors to ELK
In combination with #211 (closed) this would allow us to get notified of errors like:
- A user tried to add a DTR with a requestor other than the user making the request (if the user is NOT a PA)
- A landing zone script tried to submit a data package with a different
purpose
than the DTR
This would allow us to both get proactively notified in case of bugs from the portal frontend / landing zones as well as early detection of potential attackers that try to abuse the system.