DEV: Revert guardian changes (#24742)

I took the wrong approach here, need to rethink.

* Revert "FIX: Use Guardian.basic_user instead of new (anon) (#24705)"

This reverts commit 9057272ee2.

* Revert "DEV: Remove unnecessary method_missing from GuardianUser (#24735)"

This reverts commit a5d4bf6dd2.

* Revert "DEV: Improve Guardian devex (#24706)"

This reverts commit 77b6a038ba.

* Revert "FIX: Introduce Guardian::BasicUser for oneboxing checks (#24681)"

This reverts commit de983796e1.

plugins/poll/lib/polls_updater.rb

@@ -114,7 +114,7 @@ module DiscoursePoll
               polls,
               each_serializer: PollSerializer,
               root: false,
-              scope: Guardian.basic_user,
+              scope: Guardian.new(nil),
             ).as_json
           post.publish_message!("/polls/#{post.topic_id}", post_id: post.id, polls: polls)
         end