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/feeds_cli.rb

@@ -9,6 +9,7 @@ module Mastodon
     def self.exit_on_failure?
       true
     end
+
     option :all, type: :boolean, default: false
     option :background, type: :boolean, default: false
     option :dry_run, type: :boolean, default: false
@@ -58,7 +59,7 @@ module Mastodon
         account = Account.find_local(username)
 
         if account.nil?
-          say("Account #{username} is not found", :red)
+          say('No such account', :red)
           exit(1)
         end