Change long-running to queued processes or background processes

[Kristina Hoeppner]

Creating accounts via CSV file and deleting accounts in bulk can take a very long time when you have a lot of people to create or delete.

It would be better if we outsourced that and didn't tie up the web server but ran that in the background or via a queue and then send the person who kicked the job off a notification once done, similarly to the export queue.

For example NGinx hardening suggestions state that the web server should have a limit of 10 seconds for being tied up. See for example https://kubernetes.github.io/ingress-nginx/deploy/hardening-guide/ (Section 2.4.3).