feat: use k8s snap in dev preset #232

Job	Run time
Build concierge	1m 14s
Define spread matrix	6s
Spread (extra-debs)	50s
Spread (extra-packages-config-file)	50s
Spread (extra-snaps)	50s
Spread (juju-model-defaults)	51s
Spread (overrides-env)	50s
Spread (overrides-priority)	50s
Spread (preset-dev)	50s
Spread (preset-k8s)	50s
Spread (preset-machine)	50s
Spread (preset-microk8s)	49s
Spread (provider-google)	40s
Spread (provider-k8s)	49s
Spread (provider-lxd)	50s
Spread (provider-lxd-init-no-bootstrap)	50s
Spread (provider-microk8s)	49s
Spread (provider-none)	35s
Spread (restore)	49s
	15m 2s

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