store: set validation-sets on actions when refreshing
* Set validation-sets on actions when refreshing and assembling actual JSON.
There was a bug where validation-sets were set on actions when refreshing, but when actual snap actions were transformed into JSON request the validation-sets field would only get carried over for "install".
* Also support passing validation-sets in current snap context.
* Set validation-sets unconditionally on action json (it's going to be nil except for install/refresh).
tests/main/snap-quota-groups: add 219 as possible exit code
It seems when starting a systemd service in a slice for systemd 250, that another possible error code during creation of the cgroup for the service, that if the limit is set low enough, error code 219 is thrown because it runs out of memory