[automerger skipped] Revert "Revert "[pm] remove old stage dirs on low storage"" am: bd25f706 -s ours

am skip reason: skipped by user schfan

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

Change-Id: I284ba2ba12f8533a890e757189edb36399582c1d