Additional code review observations on Attach() functionality from https://github.com/cucumber/godog/pull/623

[Johnlon]

🤔 What's changed?

Added _example/attachments.
Added further test case for multiple calls to Attach() within a single step.
Code review comment applied - use a slice of object instead of slice of pointer

⚡️ What's your motivation?

Comments made here #623

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

♻️ Anything particular you want feedback on?

📋 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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[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 79.56%. Comparing base (153db4e) to head (2aea80c).
Report is 10 commits behind head on main.

❗ Current head 2aea80c differs from pull request most recent head 15d425e

Please upload reports for the commit 15d425e to get more accurate results.

Files	Patch %	Lines
suite.go	66.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #628      +/-   ##
==========================================
- Coverage   83.21%   79.56%   -3.65%     
==========================================
  Files          28       40      +12     
  Lines        3413     3117     -296     
==========================================
- Hits         2840     2480     -360     
- Misses        458      518      +60     
- Partials      115      119       +4     

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