Remove duplication in poll actions tables

We were using the same logic in four different places, so we're creating
a new class to handle that logic.

Note that I didn't find a way to delegate the `content` method to a
`Admin::TableActionsComponent`, so we're delegating the `action` method
instead. That means we need to create a method returning an
`Admin::TableActionsComponent`. We also need to cache this object;
otherwise we were getting an error when calling `actions.action` from
the `Admin::Poll::Questions::TableActionsComponent`.

app/components/admin/poll/questions/answers/table_actions_component.rb

@@ -1,14 +1,7 @@
 class Admin::Poll::Questions::Answers::TableActionsComponent < ApplicationComponent
   attr_reader :answer
-  delegate :can?, to: :helpers
 
   def initialize(answer)
     @answer = answer
   end
-
-  private
-
-    def actions
-      [:edit, :destroy].select { |action| can?(action, answer) }
-    end
 end