Docs: Fixes for 8.3

[kylegach]

What I did

Docs fixes for 8.3

Checklist for Contributors

Testing

N/A

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for 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:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

Greptile Summary

This pull request updates documentation and configuration for the Storybook Test addon, focusing on the Vitest plugin integration and terminology changes.

• Updated documentation URLs from 'test-runner-with-vitest' to 'vitest-plugin' in code/addons/test/src/postinstall.ts
• Corrected import statement for Sveltekit plugin in Vitest configuration example in docs/_snippets/vitest-plugin-vitest-config.md
• Changed references from 'test runner with Vitest' to 'Vitest plugin' in docs/writing-tests/component-testing.mdx

[greptile-apps]

LGTM

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