Merge "snapshotctl: Add apply-update option" into main am: 209266f4f6

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2954451

Change-Id: Ie0ca7629d27a07ea688c6546416e0443edd3f59c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>