Fix secondary storage namespace for duplicate jobs

What does this MR do and why?

In !85740 (merged) we introduced a MultiStore to transition duplicate jobs data from Sidekiq.redis to SharedState. We used the Gitlab::Redis::Queues store to point to the current data, but omitted that Sidekiq.redis is namespaced. This is actually an existing mishap, in that with the current state keys are actually stored under "resque:gitlab:resque:gitlab:duplicate:". We add the namespace to the Queues store for compatibility with the current state, but leave SharedState with no namepsace so keys that land there have proper format.

We also fix the extra data format in the error log messages.

Part of gitlab-com/gl-infra/scalability#925 (closed)

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