Merge "Clean staging dirs in build_image.py" into main am: c3838259

Original change: https://android-review.googlesource.com/c/platform/build/+/2736954



Change-Id: I8731127af428888c1be3035c0e9f3244964ab7e3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>