refactor: remove unnecessary function

* Devise library already does that for us

app/builders/agent_builder.rb

@@ -16,7 +16,6 @@ class AgentBuilder
   def perform
     ActiveRecord::Base.transaction do
       @user = find_or_create_user
-      send_confirmation_if_required
       create_account_user
     end
     @user
@@ -34,15 +33,6 @@ class AgentBuilder
     User.create!(email: email, name: name, password: temp_password, password_confirmation: temp_password)
   end
 
-  # Sends confirmation instructions if the user is persisted and not confirmed.
-  def send_confirmation_if_required
-    return unless user_needs_confirmation?
-    if @user.confirmation_sent_at.nil? || @user.confirmation_sent_at < 1.hour.ago
-      @user.update(confirmation_sent_at: Time.current)
-      @user.send_confirmation_instructions
-    end
-  end
-
   # Checks if the user needs confirmation.
   # @return [Boolean] true if the user is persisted and not confirmed, false otherwise.
   def user_needs_confirmation?