[Bug] Fix camera cloning by adding newParent parameter

[carolhmj]

Related forum issue: https://forum.babylonjs.com/t/invoke-clone-with-camera-childnode-can-not-keep-structure/29648 and Playground: https://playground.babylonjs.com/#FZPMS1

[azure-pipelines]

Please make sure to tag your PR with "bug", "new feature" or "breaking change" tags.

[azure-pipelines]

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