chore: test project updates 2023-Q3 (#2679)

* fix

This fixes an issue where ConnectionModeScript and/or StatsDisplay would throw an exception if certain optional properties were not defined.

* update

Minor adjustment to the Spawner class where if the frequency of spawning is set to zero it will only spawn 1 instance (i.e. a one shot spawner).
Updated several samples to use UnityTransport as opposed to UNet.
Limited number of objects spawned, adjusted the ray cast line renderer, updated the physics player to have a ray pointing towards its forward (to know the direction you are going) in physics example.
Adjusted the connect mode buttons so they will automatically re-appear when you disconnect.
Updated several projects to have their own network prefab list.

testproject/Assets/Prefabs/PhysicsPlayer.prefab

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