Use Contact User as Relay, Report, Subscribe. (#9661)

* Use Contact User as Relay, Report, Subscribe.

* Use Account.representative to fetch contact user.

* Use find_local.

* No reason to use Account.representative in subscribe_service.

* Don't required representative!

* Fallback is included in Account.representative method.

app/models/relay.rb

@@ -68,7 +68,7 @@ class Relay < ApplicationRecord
   end
 
   def some_local_account
-    @some_local_account ||= Account.local.find_by(suspended: false)
+    @some_local_account ||= Account.representative
   end
 
   def ensure_disabled