Migrate all ActiveJobs to Sidekiq jobs

[kitallis]

Context

This is a pure technical debt requirement. All our background jobs are run through the sidekiq adaptor. But many of the jobs do not inherit from ActiveJob, but instead just call include Sidekiq::Job.

Sidekiq jobs have a lot more control and testing ease than active job counterparts, in general. So we should move them all to be consistent, and actually move to include Sidekiq::Job instead.

Requirements & acceptance criteria

Move all jobs to include Sidekiq::Job. Do this by changing ApplicationJob to simply include it and have all jobs inherit from ApplicationJob.

This would broadly require:

• changing the call-sites to be perform_async rather than perform_later
• fixing tests for the jobs

Additional notes

This will also allow us to add more details for sentry exceptions, because we can write Sidekiq middlewares to do that.

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[gitstart-connector]

This issue has been handed off to GitStart: https://clients.gitstart.com/tramline/11653/tickets/TRAB-690