Stop caching repository size in Redis

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Repository#size is cached in Redis, as some time ago it wasn't stored as in the project_statistics table too. But now, the only caller I seem to be able to find is the the updater of the cache. At this time this service doesn't even invalidate the cache.

If we stop caching it, I suspect it won't have a large effect on Gitaly. Although its hard to predict as the ProjectCacheWorker runs quite a lot, however, most of those runs aren't to update the repository size.