Investigate the use of job-iteration gem for long running jobs

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We have many places in our codebase that could benefit from having jobs that are easily pausable/resumable. Any long running batch-like jobs needs to reliably iterate over a set of records, and they all have to implement many safe-guards that could be abstracted into something reusable, making it easier to write, test, and comprehend.

Shopify did that based on ActiveJob abstraction: https://github.com/Shopify/job-iteration. We should investigate if that is a good fit for us (would require to migrate the jobs to use ActiveJob baseclass instead of the Sidekiq one) or if we need to port it to use Sidekiq directly.