Verify gzipped content functions correctly

[davidjgoss]

🤔 What's changed?

Add a scenario and supporting steps to verify that when gzipped content is uploaded by the Cucumber implementation, with the correct headers, it will be stored that way in S3 and then successfully loaded and rendered in the browser app.

🏷️ What kind of change is this?

• 📖 Documentation (improvements without changing code)
• 🏦 Refactoring/debt/DX (improvement to code design, tooling, etc. without changing 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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