Do not remove "dead" domains in tootctl accounts cull (#9108)

Leave `tootctl accounts cull` to simply check removed accounts from
live domains, and skip temporarily unavailable domains, while listing
them in the final output for further action.

Add `tootctl domains purge DOMAIN` to be able to purge a domain from
that list manually

lib/mastodon/emoji_cli.rb

@@ -10,6 +10,7 @@ module Mastodon
     def self.exit_on_failure?
       true
     end
+
     option :prefix
     option :suffix
     option :overwrite, type: :boolean