Use `withChartViewport` inside the network chart component

[canova]

Currently we don't use withChartViewport and handle the viewport related logic in in there. But Markus pointed out here that because of this network chart doesn't support pinch-zoom and panning. We should make this component use withChartViewport so it can support these, and we can simplify the mouseMove event handler by removing getBoundingClientRect and a bunch of margin related constants.

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