Remove duplication rendering comments

We were using the same code 5 times, with the only slight variation
being the extra heading in the debates section.

app/components/shared/comments_component.rb

@@ -0,0 +1,9 @@
+class Shared::CommentsComponent < ApplicationComponent
+  attr_reader :record, :comment_tree
+  delegate :current_user, :current_order, :locale_and_user_status, :commentable_cache_key, to: :helpers
+
+  def initialize(record, comment_tree)
+    @record = record
+    @comment_tree = comment_tree
+  end
+end