Bugfix: Private notes in emails & broken Signup (#1068)

* Bugfix: Private notes in emails

Private notes were sent in the emails as part of
conversation continuity. Fixed this issue.

Also made the changes to not even queue the mails
if message is a private note.

* Bugfix: Change issue with featurable in signup - passing array
* Bugfix: Added specs for checking  private notes being sent in email

spec/mailers/conversation_reply_mailer_spec.rb

@@ -34,10 +34,16 @@ RSpec.describe ConversationReplyMailer, type: :mailer do
     end
 
     context 'without summary' do
-      let(:conversation) { create(:conversation, assignee: agent) }
-      let(:message_1) { create(:message, conversation: conversation) }
-      let(:message_2) { build(:message, conversation: conversation, message_type: 'outgoing', content: 'Outgoing Message') }
-      let(:private_message) { create(:message, content: 'This is a private message', conversation: conversation) }
+      let(:conversation) { create(:conversation, assignee: agent, account: account).reload }
+      let(:message_1) { create(:message, conversation: conversation, account: account, content: 'Outgoing Message 1').reload }
+      let(:message_2) { build(:message, conversation: conversation, account: account, message_type: 'outgoing', content: 'Outgoing Message 2') }
+      let(:private_message) do
+        create(:message,
+               content: 'This is a private message',
+               conversation: conversation,
+               account: account,
+               message_type: 'outgoing').reload
+      end
       let(:mail) { described_class.reply_without_summary(message_1.conversation, Time.zone.now - 1.minute).deliver_now }
 
       before do
@@ -52,7 +58,6 @@ RSpec.describe ConversationReplyMailer, type: :mailer do
         # make the message private
         private_message.private = true
         private_message.save
-
         expect(mail.body.decoded).not_to include(private_message.content)
       end