The legacy config is deprecated and will be removed in eslint 10. The flat config also allows us to write js functions which will assist in handling limitations with multiple identical rules.
Upgrade storybook to version v8 which is a major upgrade. Storybook provides an
upgrade wizard which did most of the work.
- Ran npx storybook upgrade.
- Manually updated `remark-gfm` since the newer mdx requires v 4.
- Migrated all old stories still using `Story` to `StoryObj`.
