Fix role ban loading bugs (#32725)

Fix role ban loading bugs (#32725)

This code was a mess. Now it's less of a mess and user UserDbDataManager now.

Fixes the following bugs:

* If you connect to a server, restart your client, connect again in the same round, you role bans would not be visible in the client.
* If you role ban somebody who is not connected to the server, then they connect within the round, they will only have the recently-applied ban.

Likely fixes #24781, #27282