Add "Number of items answered" metric in the overview table

[zkoppert]

Is your feature request related to a problem?

When running the action on discussions, it would be nice to be able to see the "Number of items answered" metric in the overview table

Describe the solution you'd like

If discussion is found in the search_query then count the number of discussions marked as answered and display the count in the markdown and json output.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

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