Fix unused step defs

[UL-ChrisGlew]

🤔 What's changed?

The 'Find Unused Step Definitions' context menu should no longer show step definitions decorated with the 'StepDefinition' attribute as unused when one or more is used with a Given/Then/When.

⚡️ What's your motivation?

Fix for #22.

🏷️ What kind of change is this?

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

♻️ Anything particular you want feedback on?

I've attempted to add a new unit test to test this. This involved adding some logic to correctly add a 'StepDefinition' attribute into the 'MockableDiscoveryService' - let me know if there's any better way of doing this.

📋 Checklist:

• 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 "[vNext]" section of the CHANGELOG, linking to this pull request & included my GitHub handle to the release contributors list.

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[gasparnagy]

This is cool! The code is fine.

My only request is to update the changelog. (Besides adding a line about the change, please also add a line at the end of the section starting with *Contributors of this release (in alphabetical order):* , and put your own GitHub handle there, similarly how we just started with the core project here: https://github.com/reqnroll/Reqnroll/blob/main/CHANGELOG.md?plain=1

[UL-ChrisGlew]

@gasparnagy I've updated the Changelog with the requested changes.

[gasparnagy]

Thx!

[gasparnagy]

@UL-ChrisGlew I added you to the group already, but you still deserve the "official" intro: 😎 Thx for the help!

Thank you for the contribution! According to our guidelines I have invited you to the Reqnroll contributors team. Congrats! 🎉 If you accept it, you will be able to make pull requests easier in the future.

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