Add bridge code to clear deprecated diff cache entries
The following discussion from !19917 (merged) should be addressed:
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@oswaldo started a discussion: (+2 comments) @kerrizor @reprazent Just a heads-up: we expect the memory consumption on redis clusters to consistently raise then fall back when finally activating it for all GitLab.com projects as our current cache will take up to 7 days for completely expiring.
We might want to sync with #production for manually cleaning the old cache, preventing any kind of saturation, or just making sure we'll have enough space for both caches in this ramp up timeframe.