[WIP] Check for any unused functions in packages/react/ and delete

[Copilot]

• Identify files with unused functions in packages/react/src/utils/
  • Found duplicate story helper files (form-story-helpers.tsx and story-helpers.tsx)
  • StressTest.tsx is only used for development and testing
  • useDialog is only used by the deprecated DialogV1 component
• Check for unused dependencies in package.json
  • Verified afterframe is already in devDependencies - correctly placed
• Prepare code cleanup plan
  • Consolidate duplicate story helper files
  • Properly categorize development-only dependencies
• Execute removal of unused/duplicated code
  • Created new storybook-helpers.tsx file combining functionality from both duplicate files
  • Updated all imports across the codebase to use the new file
  • Removed the duplicate form-story-helpers.tsx and story-helpers.tsx files
• Run tests to ensure our changes don't break any functionality
  • Verified tests pass for components using these utilities

Fixes #6101.

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