wc-generator: we should add `data-demo-script="true"` attributes to demo to support surge

[Izook]

Is your feature request related to a problem? Please describe.

I have to manually add the data-demo-script="true" attribute to my demos to support the surge workflow.

Describe the solution you'd like

The data-demo-script="true" attribute should be automatically added to demos so that the default component supports the surge workflow.

Describe alternatives you've considered

No response

Additional context

No response

[blackfalcon]

@Izook this issue is assigned to a PR, does that mean this work is in progress?

[Izook]

I just opened that PR to demonstrate what I mean by the issue, I didn't want to officially mark it as in-progress or work on it without prioritizing it