[automerger skipped] Revert "Revert "[pm] remove old stage dirs on low storage"" am: bd25f70623 -s ours am: 40ef8ac08d -s ours

am skip reason: skipped by user schfan

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16058207

Change-Id: Ib6d2854be4f6abf2a87ff18d58c11d88ee704127