It will cause a crash if a level remove from world failed

It is hard to reproduce the crash, but there is a scenario to cause it.

For example, there are two streaming levels in StreamingLevelsBeingConsidered list.

The first one's CurrentState is ECurrentState::MakingVisible, and it will try to World->AddToWorld. Because the bConsiderTimeLimit, the level may not finish the process of UWorld::AddToWorld, so the CurrentLevelPendingVisibility will not be nullptr.

Then, the second level's CurrentState is ECurrentState::LoadedNotVisible, and TargetState is ETargetState::Unloaded,  so it will try to DiscardPendingUnloadLevel and call UWorld::RemoveFromWorld, but because the CurrentLevelPendingVisibility  is not nullptr, it will fail to remove from world, and it will cause a crash when calling ClearLoadedLevel at check(PendingUnloadLevel == nullptr);

UE-74991 also affects Valve Index

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