feat: support TestStepResult.exception

[davidjgoss]

🤔 What's changed?

This PR adds support in the components for an exception object within the TestStepResult. This is designed to give more structured information about a problem than the flat string message field. We'll now use the exception (and disregard the old message field) if present.

⚡️ What's your motivation?

Make use of the structured exception object for Cucumber implementations that support it, whilst maintaining backwards-compatibility with those that don't yet.

🏷️ What kind of change is this?

• ⚡ New feature (non-breaking change which adds new behaviour)

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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[davidjgoss]

Updated in a backwards-compatible way to allow content as children instead of a string prop - we need this to use in our new component.

[davidjgoss]

This edits are due to upstream changes in the CCK sources.

[mpkorstanje]

The "with stacktrace" step fails in the preview with;

TypeError Cannot read properties of null (reading 'type')
    at TodosPage.addItem (/Users/somebody/Projects/my-project/support/pages/TodosPage.ts:39:21)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at CustomWorld.<anonymous> (/Users/somebody/Projects/my-project/support/steps/steps.ts:20:5)

[davidjgoss]

@mpkorstanje thats the actual presentation, not an error when trying to render.

[luke-hill]

Might need some support here as this now means the ruby side renders a shorter message than previously before. All stacktrace data is now missing

Will chat to you later about this @davidjgoss