Turn on storyStoreV7 in Storybook

[jpveooys]

This speeds up Storybook loading time.

See https://github.com/storybookjs/storybook/blob/next/MIGRATION.md#using-the-v7-store

And https://storybook.js.org/blog/storybook-on-demand-architecture/

To turn on add this to .storybook/main.js:

  framework: '@storybook/react',
  features: {
    storyStoreV7: true,
  },

[jpveooys]

Pausing this for now as there are currently some drawbacks from using this. However, a working version of it is on this branch:

https://github.com/defencedigital/mod-uk-design-system/tree/docs/storybook-story-store

[github-actions[bot]]

This issue has been marked as stale because it has been open for 60 days with no activity