fix: Draggable nodes should respect drag handles

[matthewmullin01]

Fixes #3518

It's possible to drag an interactive node view without using the drag handle. The drag doesn't actually do anything, presumably because it only works when the drag handle is used.

With this fix nodes are only draggable via their drag handle. I believe this is the intended behaviour if I look at the docs

To make your node views draggable, set draggable: true in the extension and add data-drag-handle to the DOM element that should function as the drag handle.

Before	After
Screen.Recording.2023-01-30.at.11.52.17.AM.mov	Screen.Recording.2023-01-30.at.11.56.18.AM.mov

How to test

• Check the latest deploy preview DragHandle page here. Ensure that nodes are only draggable by the drag handle.

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[matthewmullin01]

Thanks for the review @bdbch! Just had some last min conflicts to solve, otherwise it's exactly as it was before.