Notify `runit_service` resource instead of directly notifying `service` resources

While the runit cookbook still provides a legacy service resource to directly notify, they now recommend notifying the runit_service resource instead - https://github.com/chef-cookbooks/runit/blob/master/README.md

This looks like a good thing for us to standardize, since all our services are through runit_service. I think this may also help with making !3958 (merged) cleaner.