Merge "snapshotctl: Create and write pre-created snapshots" into main am: 51e3b9cbca am: 8857bc99b7

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

Change-Id: I3d72c283a2f9be8f523025cfc74d042d1a5d99ba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>