fix: network manager does not clean up if exception is thrown while starting#3864

EmandM merged 13 commits intodevelop-2.0.0Unity-Technologies/com.unity.netcode.gameobjects:develop-2.0.0from

fix/3552-networkmanager-fails-to-cleanup-if-exception-thrown-during-startUnity-Technologies/com.unity.netcode.gameobjects:fix/3552-networkmanager-fails-to-cleanup-if-exception-thrown-during-startCopy head branch name to clipboard