feat: Route emails based on x-original-to in email channel (#6901)

Fixes: #6608
ref: https://linear.app/chatwoot/issue/CW-30/emails-not-routed-based-on-x-original-to

spec/finders/email_channel_finder_spec.rb

@@ -31,6 +31,30 @@ describe ::EmailChannelFinder do
         channel = described_class.new(reply_mail.mail).perform
         expect(channel).to eq(channel_email)
       end
+
+      it 'return channel with cc email' do
+        channel_email.update(email: 'test@example.com')
+        reply_mail.mail['to'] = nil
+        reply_mail.mail['cc'] = 'test@example.com'
+        channel = described_class.new(reply_mail.mail).perform
+        expect(channel).to eq(channel_email)
+      end
+
+      it 'return channel with bcc email' do
+        channel_email.update(email: 'test@example.com')
+        reply_mail.mail['to'] = nil
+        reply_mail.mail['bcc'] = 'test@example.com'
+        channel = described_class.new(reply_mail.mail).perform
+        expect(channel).to eq(channel_email)
+      end
+
+      it 'return channel with X-Original-To email' do
+        channel_email.update(email: 'test@example.com')
+        reply_mail.mail['to'] = nil
+        reply_mail.mail['X-Original-To'] = 'test@example.com'
+        channel = described_class.new(reply_mail.mail).perform
+        expect(channel).to eq(channel_email)
+      end
     end
   end
 end