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/services/report_service.rb

@@ -52,6 +52,6 @@ class ReportService < BaseService
   end
 
   def some_local_account
-    @some_local_account ||= Account.local.where(suspended: false).first
+    @some_local_account ||= Account.representative
   end
 end