Convert ConfidentialEpicWorker perform method to no-op as step 1/3 in removal

Nasser Zahranirequested to merge
553861-confidential-epic-worker-no-op into master

What does this MR do and why?

The ConfidentialEpicWorker is no longer used and being deprecated in 3 steps across 3 milestones. This first step converts the perform method to a no-op, next milestone a migration will ship to remove any sidekiq jobs for this worker, before it is removed outright.

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Related to #553861 (closed)

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