Update Storybook to 8.2.6 (latest), and move preview deploys to /brand

[joshfarrant]

Summary

Update Storybook to latest, along with associated dependencies. Also moves preview deploys to live under /brand to match production.

List of notable changes:

• Packages
  • Updated Storybook (and its addons) from 7.6.17 to 8.2.6 (latest).
  • Updated TypeScript from 4.9.5 to 5.5.4 (latest).
  • Updated jest and ts-jest from 27.5.1 to 29.7.0 (latest).
  • Added jest-environment-jsdom as that's no longer included in jest and must be installed separately.
• Deploy preview builds under /brand to more closely match production and make asset handling simpler in preview deploys.
• Modified paths of static assets in docs and storybook to point to their respective local static directories
• Updated axe-clean.spec.ts to use new index.json format instead of deprecated stories.json
• Updated playwright.generate-tests.ts to use new index.json format instead of deprecated stories.json
  • This has caused the visual specs to be sorted in a slightly different order. This shouldn't have any actual effect, but that's the reason for the changes to the *.visual.spec.ts files. Because of this, it might be easier to view those changes in isolation when reviewing this PR

What should reviewers focus on?

• Verify that the docs and storybook work as expected on the preview deploy now that they're being served under /brand
• Check that all our tests pass and the package updates haven't introduced any regressions

Steps to test:

• Link to preview deployment

Supporting resources (related issues, external links, etc):

Contributor checklist:

• All new and existing CI checks pass
• Tests prove that the feature works and covers both happy and unhappy paths
• Any drop in coverage, breaking changes or regressions have been documented above
• New visual snapshots have been generated / updated for any UI changes
• All developer debugging and non-functional logging has been removed
• Related issues have been referenced in the PR description

Reviewer checklist:

• Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• Check that tests prove the feature works and covers both happy and unhappy paths
• Check that there aren't other open Pull Requests for the same update/change

[changeset-bot]

⚠️ No Changeset found

Latest commit: b2af2ad

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

🟢 No design token changes found

[github-actions]

🟢 No visual differences found

Our visual comparison tests did not find any differences in the UI.

[rezrah]

This is looking great 🙌

@joshfarrant - just two minor questions about dependency changes. Also could you please update the snapshots one more time to be sure there's no additional regressions with the latest changes please, seems like it hasn't run in a while.

[joshfarrant]

Thanks @rezrah, I've responded to and resolved both comments

I've been running the snapshot update in docker locally and all's good, but I've re-applied the label again just to be sure 👍