feat: Support cc and bcc in email replies (#3098)

Co-authored-by: Tejaswini <tejaswini@chatwoot.com>
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/mailers/conversation_reply_mailer.rb

@@ -19,7 +19,9 @@ class ConversationReplyMailer < ApplicationMailer
            reply_to: reply_email,
            subject: mail_subject,
            message_id: custom_message_id,
-           in_reply_to: in_reply_to_email
+           in_reply_to: in_reply_to_email,
+           cc: cc_bcc_emails[0],
+           bcc: cc_bcc_emails[1]
          })
   end
 
@@ -39,7 +41,9 @@ class ConversationReplyMailer < ApplicationMailer
            reply_to: reply_email,
            subject: mail_subject,
            message_id: custom_message_id,
-           in_reply_to: in_reply_to_email
+           in_reply_to: in_reply_to_email,
+           cc: cc_bcc_emails[0],
+           bcc: cc_bcc_emails[1]
          })
   end
 
@@ -142,6 +146,15 @@ class ConversationReplyMailer < ApplicationMailer
     nil
   end
 
+  def cc_bcc_emails
+    content_attributes = @conversation.messages.outgoing.last&.content_attributes
+
+    return [] unless content_attributes
+    return [] unless content_attributes[:cc_emails] || content_attributes[:bcc_emails]
+
+    [content_attributes[:cc_emails], content_attributes[:bcc_emails]]
+  end
+
   def inbound_email_enabled?
     @inbound_email_enabled ||= @account.feature_enabled?('inbound_emails') && @account.inbound_email_domain
                                                                                       .present? && @account.support_email.present?