ConversationList: Show replied/forwarded status

## What Happened
After replying or forwarding an email message, there is no indication of this action next to it.
Other email clients will add a status icon next to the message after replying or forwarding it so the user know that one of these actions was taken with the message.

I found this https://github.com/elementary/mail/issues/37 from 2019 that is already closed, but it seems it was not implemented in the new Mail app for Odin.

## Expected Behavior
After replying or forwarding an email message, a "replied" or "forwarded" icon is added next to the message so the user knows that one of these actions was taken with the message.

## Steps to Reproduce
1. Select a message from Inbox
2. Reply or forward it
3. No indication that either of these actions were taken is available.

### Logs
N/A

## Platform Information
elementary OS 6 Odin
io.elementary.mail/focal,now 6.1.1+r701+pkg24~ubuntu6.1