Add content validation service and worker

Linjie Zhangrequested to merge
247-add-content-validation-service into main-jh

This MR add ContentValidation::CommitService, ContentValidation::ComplaintService, ContentValidation::ContainerService, ContentValidation::ProcessChangesService, ContentValidation::CommitServiceWorker and update sidekiq_config.rb.

Splited from gitlab-jh/gitlab!128

Edited by Linjie Zhang

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