Add correct help link for SidekiqLoadBalancing/WorkerDataConsistency Cop

What does this MR do and why?

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In Split Sidekiq development docs into separate files (!78186 - merged) the help section for the SidekiqLoadBalancing/WorkerDataConsistency cop was moved to https://docs.gitlab.com/ee/development/sidekiq/worker_attributes.html#job-data-consistency-strategies . This MR adds the new correct help link to the cop message.

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Related to #390577 (closed)