Extract the ObjectStorage::Concern#migrate! method to a service.

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Summary

Object storage migration for files is currently implemented in the Uploader as a concern. It should be refactored to be uploader agnostic to correctly handle move_to_store and move_to_cache.

As @ayufan suggested, we could also remove the CarrierWave component from this and directly work with the file APIs.

Possible fixes

Extract to an external service.

(If you can, link to the line of code that might be responsible for the problem)