Issue #3529535: Fix render context error in story generation

Tormi Taborrequested to merge
issue/storybook-3529535:3529535-render-context-error into 1.x

Story generation fails with "Render context is empty" error when components use custom Twig functions requiring render context (bem(), attach_library(), etc).

  • Inject RendererInterface service into StorybookCommands constructor
  • Wrap generateStoriesJsonFile() in executeInRenderContext() with RenderContext
  • Add StorybookCommands service definition with renderer dependency

Ensures Twig rendering happens within proper Drupal render context.

Closes #3529535

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