Add nyc coverage regex to example pattern list

What does this MR do?

Adds an example regex for capturing code coverage when using nyc and mocha - two extremely popular libraries in the npm ecosystem.

There is no example regex provided, and the solution in the referenced issue for how to properly capture the coverage when using colors has 18 thumbs-up, indicating that this is a common problem.

Here is an example of the regex working:
https://regex101.com/r/A2oIXf/4

What are the relevant issue numbers?

Closes #29642 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer