[REQUEST] Remove highcharts from initial page load

[IgnaceMaes]

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

Currently Highcharts is fetched on initial page load. This is a quite a significant package size that is being loaded, while it might not be used on the page. It's only used on the Survey page.

Describe the solution you'd like

Lazy load highcharts using await import() so it can get split into a separate chunk by ember-auto-import.

Describe alternatives you've considered

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Additional context

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