Merge "snapshotctl: Create and write pre-created snapshots" into main am:...

Merge "snapshotctl: Create and write pre-created snapshots" into main am: 51e3b9cb am: 8857bc99 am: cf871b25

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2739093



Change-Id: I60e55af3d63e36ceb75de014058e031b9bdea966
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>