Store remote votes URI (#10158)

* Store remote votes URI

* Add spec for accepting remote votes

* Make poll vote id generation work the same way as follows

app/models/poll_vote.rb

@@ -9,6 +9,7 @@
 #  choice     :integer          default(0), not null
 #  created_at :datetime         not null
 #  updated_at :datetime         not null
+#  uri        :string
 #
 
 class PollVote < ApplicationRecord
@@ -20,6 +21,8 @@ class PollVote < ApplicationRecord
 
   after_create_commit :increment_counter_cache
 
+  delegate :local?, to: :account
+
   private
 
   def increment_counter_cache