chore(appflow): remove appflow from @ionic/cli (#4777)
BREAKING CHANGE:
The `package` commands and the `deploy build` command have been removed. Developers should migrate to the Ionic Cloud CLI instead.
- Using `deploy build`? Migrate to ionic-cloud build web and if you used the -channel option, also use ionic-cloud deploy web.
- Using `package` commands? Migrate to ionic-cloud build and ionic-cloud deploy.
See https://ionic.io/docs/appflow/cli/overview for more information on the Ionic Cloud CLI.