Insights - Add insights charts to storybook

Background

While discussing some options for improvements to some existing charts, it was noticed that the current charts for groupoptimize arent very straightforward to experiment and interact with.

Related to &11681

Proposal

• Add a story file for the insights_chart
• Add a story file for the insights_chart_error
• Add a story file for the insights_page

Implementation guide

• Add a new story file named insights_chart.stories.js for the insights_chart.vue component - !157713 (merged)
  • The default story should render the chart with data
  • Add a story for the chart without any data available
  • Add a story for the chart in the loading state (loaded=false)
• Add a new story file named insights_chart_error.stories.js for the insights_chart_error.vue component
• Add a new story file named insights_page.stories.js for the insights_page.vue component with all props specified

Take a look at the type_of_work_charts.stories.js file for some inspiration