rename stop_vm_launcher_service to shutdown_vm am: e2514fe5f4

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/3539121

Change-Id: Ifa01bdae359088063cb15b79adceb41afcaddd67
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>