#23708 Add volta pin settings and duplicate packageManager setting

[johnhunter]

Closes #23708

What I did

• Added volta pin settings to the root package.json. This has no impact if Volta is not used for node version management. However, since setup indicates we should use a specific node version it might be useful to support it.
• Duplicated the packageManager:yarn version into the volta settings.
• Updated documentation for optional use of Volta

How to test

1. With a fresh storybook repo
2. Install Volta (if not already installed)
3. Run yarn start
   you should see the volta shim first install required node and yarn versions
4. Run yarn test

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "build", "documentation", "maintenance", "dependencies", "other"]

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

[ndelangen]

Thank you @johnhunter, this is great!

[johnhunter]

Thanks @ndelangen I had some good feedback on discourse suggesting we should not be prescriptive about node versions but rather include various node versions in the CI tests. That would be a great approach but we have quite big CI matrix as it is - maybe one for a future discussion 😀

[ndelangen]

We considering dropping support for node16 a breaking change, (node 16 is the minimum requirement for storybook).

In 8.0 we're dropping node16 support, and then will make the switch to CI run node18 as well.