Use old behaviour when root.autorun=false

[YegorStepanov]

Breaking change has been added here.

Before breaking commit:

Scene.AutoRun=true:
  Awake
  Root.Configure
  Scene.Configure
  Awake end
Scene.AutoRun=false:
  Awake
  Root.Configure
  Awake end

After breaking commit:

Scene.AutoRun=true:
  Root.Configure
  Awake
  Scene.Configure
  Awake end
Scene.AutoRun=false:
  Root.Configure
  Awake
  Awake end

This PR reverts the old behaviour, when Root.AutoRun=false (Currently Root.AutoRun is not used)

I'd say that is more correctly and it requires to me:
I'm using async LifetimeScopes to preload Addressables, so I need to await Awake (via the first SceneScope, because Awake is not called on Prefab)

The public autoRun is useful for me too, currently I get these values via Reflection.

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[hadashiA]

👍