Add descriptionFromPlugin in negative scenarios

[yogeshnikam671]

What: While generating negative scenarios, Specmatic was ignoring any existing descriptionFromPlugin within a scenario. Thus, the test names were not having the descriptionFromPlugin text. This fix makes sure that descriptionFromPlugin is not ignored while generating negative scenarios.

Why: To not lose the descriptionFromPlugin information in negative scenarios.

How: By not ignoring descriptionFromPlugin while generating negative scenarios.

Checklist:

• [ ] Documentation added to the README.md OR link to PR on https://github.com/specmatic/specmatic-documentation
• [x] Tests
• [x] Tested against sample project
• [ ] Sonar Quality Gate