Killing teammates in large batches can result in 1st violation session kick

Killing a large amount of team mates at once can result in multiple kicks and/or a first violation session kick, with bSessionKickOnSecondFFViolation=true

Issue involves HandleFFViolation() being called multiple times and not having a proper check if the player has already been kicked. Kicking a player will delete the controller class, but there is a delay, and a check is required to know if it is being deleted.