Fix warnings on match end related to network player movement

[Leroy231]

Warning:

[2024.03.23-16.18.46:840][667]LogNetPlayerMovement: Warning: CreateSavedMove: Hit limit of 96 saved moves (timing out or very bad ping?)

• [x] When match ends, in AFirstPersonGameModeCommander::GameOver, for each player controller, check if player is controlling a character (if AProjectM_PlayerController::GetCurrentHumanCharacter returns non-null). If so, call UPossessSoldierEntity_AsyncAction::UnPossessControlledSoldier similar to how UMassCharacterBlueprintLibrary::OnDeath does it.
• [x] To verify, you can use console command pm.ForceGameOver to quickly end the match