Remove and migrate more celery tasks

[jmsmkn]

These have now been migrated to lambda_tasks and the periodic tasks set up.

See #4408

[amickan]

LGTM!

I have a general question though: how do you decide which tasks to migrate to lambda tasks when / in what order? And how does the period task set-up work these days (if we add new periodic tasks, should these use the lambda decorator and how do we define when they should run)?

[jmsmkn]

how do you decide which tasks to migrate to lambda tasks when / in what order?

I'm slowly going through and seeing what adds new features to test - this time it's calling new functions and mixed signatures. Trying to do things that will migrate entire apps at a time. Also avoiding anything people might be working on right now (invoices, challenges, evaluations, algorithms, reader studies).

And how does the period task set-up work these days

It's done using event bridge scheduler. See the latest commit in the cloud infrastructure repo.