fix: SpawnWithObservers not honored when EnableSceneManagement is disabled [MTT-7237]#2682

NoelStephensUnity merged 4 commits intodevelopUnity-Technologies/com.unity.netcode.gameobjects:developfrom

fix/spawnwithobservers-scenemanagement-disabledUnity-Technologies/com.unity.netcode.gameobjects:fix/spawnwithobservers-scenemanagement-disabledCopy head branch name to clipboard