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Add fine grained time buckets for cache metrics

Alejandro Rodríguez requested to merge rails-cache-metrics-buckets into master

What does this MR do and why?

Change the time buckets for the gitlab_cache_operation_duration_seconds histogram from [0.00001, 0.0001, 0.001, 0.01, 0.1, 1.0] to [0.001, 0.0025, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2]. The lower values unused, and we want more granularity between 0.1 and 1, especially now that we need to adjust the Apdex definition on gitlab-com/runbooks!5581 (merged)

Part of https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/18944

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

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