Warmup is not resilient to snapd restarting

[lengau]

Bug Description

If there's an update to snapd, the checks can fail because snapd is busy restarting.

To Reproduce

ehehheh good luck

part yaml

Relevant log output

2025-09-16T15:19:35.0943600Z Failed to wait for snap refreshes to complete.
2025-09-16T15:19:35.0945779Z * Command that failed: "lxc --project rockcraft exec local:base-instance-rockcraft-buildd-base-v71--3afc873fc929ffb5bb37 -- env CRAFT_MANAGED_MODE=1 ROCKCRAFT_DEBUG=False ROCKCRAFT_LXD_REMOTE=local ROCKCRAFT_LAUNCHPAD_INSTANCE=production DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true DEBIAN_PRIORITY=critical snap watch '--last=auto-refresh?'"
2025-09-16T15:19:35.0947900Z * Command exit code: 1
2025-09-16T15:19:35.0948677Z * Command standard error output: b'error: daemon is stopping to wait for socket activation\n'

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-4772.

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