Improve error handling in publish plugin

[davidjgoss]

🤔 What's changed?

This PR improves error handling when interacting with the Cucumber Reports service. Specifically:

• On a client (4xx) error on the initial GET request, we show the returned banner
• On a server (5xx) error on the initial GET request, we don't show the banner and instead note the status
• On any error on the subsequent PUT request, we don't show the banner and instead note the status

In all cases, this still does not cause the test run to fail.

While we're here, the plugin itself is reimplemented with fetch (which wasn't available when publish functionality was originally added) giving us less, and simpler, code.

⚡️ What's your motivation?

Better feedback for the user in case of issues with the remote reports service.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, etc. without changing behaviour)
• 🐛 Bug fix (non-breaking change which fixes a defect)

📋 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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[coveralls]

coverage: 97.736% (+0.004%) from 97.732%
when pulling 58284d4 on publish-plugin-rewrite
into f3e99ba on main.