Fix Sidekiq warnings about JSON serialization (#17381)

* Fix Sidekiq warnings about JSON serialization

This occurs on every symbol argument we pass, and every symbol key in hashes,
because Sidekiq expects strings instead.

See https://github.com/mperham/sidekiq/pull/5071

We do not need to change how workers parse their arguments because this has
not changed and we were already converting to symbols adequately or using
`with_indifferent_access`.

* Set Sidekiq to raise on unsafe arguments in test mode

In order to more easily catch issues that would produce warnings in production
code.

app/services/account_statuses_cleanup_service.rb

@@ -15,7 +15,7 @@ class AccountStatusesCleanupService < BaseService
 
     account_policy.statuses_to_delete(budget, cutoff_id, account_policy.last_inspected).reorder(nil).find_each(order: :asc) do |status|
       status.discard
-      RemovalWorker.perform_async(status.id, redraft: false)
+      RemovalWorker.perform_async(status.id, { 'redraft' => false })
       num_deleted += 1
       last_deleted = status.id
     end