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housekeeping: Skip prune if there are no old objects

Patrick Steinhardt requested to merge pks-housekeeping-prune-heuristics-mtime into master

The OptimizeRepository() RPC heuristically executes git-prune(1). The heuristic we currently use counts the number of loose objects which exist after having repacked the repository, and, if they exceed a given threshold, we'll try to remove them. This also causes us to try and prune objects though in case there are unreachable, but recent objects. But because unreachable objects don't get packed, and because we only prune objects older than two weeks, this will in many cases cause us to execute git-prune(1) without any need.

Improve the heuristic to only prune objects in case there are loose objects which have an mtime older than two weeks. This should in the general case avoid useless prunes, but still detect the case where there is work to be done.

Changelog: performance

Closes #4121 (closed)

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