Only run XbTwigExtension inside XBPreviewRenderer

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This should be feasible to do at any time, actually; it's not urgent because AFAICT it's low-risk.

Thanks, @roshni upadhyay!

Hi @wim leers, The wrapper comments in the rendered output are being added by both the Component and ComponentTreeHydrated classes. I wanted to check if the XbTwigExtension is actively being used, or if we can directly handle the wrapper comments logic within the Component and ComponentTreeHydrated classes instead.

Could you please guide me on whether we should continue using XbTwigExtension or refactor the logic to manage these comments directly within the respective classes?