jamiaccount: sync conversations when we're ready to receives clone

As soon as a device detects a new conversation it will try to clone
the conversation from this device. So, announce conversation when
the repository is cloned.

Change-Id: I921b6685967709bd8f3675508b57478dc4589edf
GitLab: https://git.jami.net/savoirfairelinux/ring-project/-/issues/1282