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Differentiate between stores in cache metrics

Alejandro Rodríguez requested to merge differentiate-cache-stores-in-metrics into master

What does this MR do and why?

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We recently introduced two new optional redis shards that act as cache stores. This means that now the gitlab_cache_operation_duration_seconds and gitlab_cache_operations_total metrics collect metrics for all these stores without any disctinction, which limits the granularity of our observability. We solve this by adding a store label to the aforementioned metrics.

Related to gitlab-com/gl-infra/scalability#2245 (closed)

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