GH-472081 | fix approve / blocked / pending users workers sidekiq offenses

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What does this MR do and why?

Per the cop, we want to avoid .find throwing a hard error and retrying because there is a likely chance the record has been deleted from the database. Although, for the job worked on in this MR - approve_blocked_pending_approval_users_worker.rb - it would be unexpected to lose the user before this job triggered, it still felt like a good opportunity to implement changes to adhere to the standard.

References

#472081

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