arc: defunct arc-snapshotd accounts

Managed Guest Session Snapshotting feature is cancelled.

BUG=b:264680377
TEST=build_packages, build_image, deploy to dut
TEST=tast run DUT arc.Managed*vm

Cq-Depend: chromium:4347930
Change-Id: Ieff485a45bdf3eaf450c3591f7a10cfad664c549
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/4351219
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Tested-by: Muhammad Hasan Khan <mhasank@chromium.org>
Commit-Queue: Muhammad Hasan Khan <mhasank@chromium.org>
diff --git a/profiles/base/accounts/group/arc-data-snapshotd b/profiles/base/accounts/group/arc-data-snapshotd
index 90f4aaf..3a72156 100644
--- a/profiles/base/accounts/group/arc-data-snapshotd
+++ b/profiles/base/accounts/group/arc-data-snapshotd
@@ -1,3 +1,4 @@
 group:arc-data-snapshotd
 gid:20153
 users:arc-data-snapshotd
+defunct:true
diff --git a/profiles/base/accounts/user/arc-data-snapshotd b/profiles/base/accounts/user/arc-data-snapshotd
index 45c17ef..e38d850 100644
--- a/profiles/base/accounts/user/arc-data-snapshotd
+++ b/profiles/base/accounts/user/arc-data-snapshotd
@@ -4,3 +4,4 @@
 gecos:User for arc-data-snapshotd service.
 home:/dev/null
 shell:/bin/false
+defunct:true