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When we run tailscled under systemd, restarting the unit kills all child processes, including "tailscale update". And during update, the package manager will restart the tailscaled unit. Specifically on Debian-based distros, interrupting `apt-get install` can get the system into a wedged state which requires the user to manually run `dpkg --configure` to recover. To avoid all this, use `systemd-run` where available to run the `tailscale update` process. This launches it in a separate temporary unit and doesn't kill it when parent unit is restarted. Also, detect when `apt-get install` complains about aborted update and try to restore the system by running `dpkg --configure tailscale`. This could help if the system unexpectedly shuts down during our auto-update. Fixes https://github.com/tailscale/corp/issues/15771 Signed-off-by: Andrew Lytvynov <awly@tailscale.com>