Add "Destroy With Scene" checkbox in inspector for NetworkObject

[AlexEnnerfelt]

Is your feature request related to a problem? Please describe.

I have a game where I load a Logic scene where I keep the Player objects and GameMode Managers, then I load an Environment scene where I spawn items like loot drops, enemies etc.

Then when I unload the environment all of the spawned enemies and other environment related objects are moved to my Logic scene because it is the Active scene, but I would like for them to be destroyed with the scene they are a part of.

Describe the solution you'd like
It would be useful to be able to set "destroyWithScene" from the inspector and saved to the prefab.

Describe alternatives you've considered
My current solution to this is to set "destroyWithScene = true" from my custom spawn manager, but there might be cases where I do not want this behaviour.