Docs: Remove more references to setProjectAnnotations

[kylegach]

What I did

Continued docs work started in #34025

Checklist for Contributors

Manual testing

1. Sync this branch with locally running docs

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-storybook/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.

Summary by CodeRabbit

• Documentation
  • Revised Vitest addon setup instructions and configuration guidance.
  • Enhanced accessibility testing documentation with detailed integration steps.
  • Consolidated and streamlined setup examples for improved clarity.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 45869c6c-2ad9-4826-98f3-b11074e06655

📥 Commits

Reviewing files that changed from the base of the PR and between a34b0cd and 3d7ba92.

📒 Files selected for processing (3)

• docs/_snippets/addon-vitest-set-project-annotations-simple.md
• docs/writing-tests/accessibility-testing.mdx
• docs/writing-tests/integrations/vitest-addon/index.mdx

💤 Files with no reviewable changes (1)

• docs/_snippets/addon-vitest-set-project-annotations-simple.md

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📝 Walkthrough

Walkthrough

Documentation updates simplify Vitest addon setup instructions by removing framework-specific annotation configuration examples and eliminating manual test file creation steps, replacing them with streamlined installation and configuration references.

Changes

Cohort / File(s)	Summary
Vitest Addon Documentation docs/_snippets/addon-vitest-set-project-annotations-simple.md, docs/writing-tests/integrations/vitest-addon/index.mdx, docs/writing-tests/accessibility-testing.mdx	Removed framework-specific (React, Svelte, Vue, Web Components) setProjectAnnotations code examples; simplified Vitest setup by removing manual test file creation and configuration steps; updated accessibility testing docs to reference Vitest addon installation flow instead of stating no configuration is needed.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• storybookjs/storybook#32843: Directly modifies the same Vitest documentation snippets and addon setup examples.
• storybookjs/storybook#32903: Overlapping changes to Vitest addon and accessibility testing documentation files with related setup flow modifications.
• storybookjs/storybook#33370: Related changes to Vitest setProjectAnnotations snippets and accessibility documentation configuration instructions.

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