documenting how to access test results

[mw-hrastega]

Added a new section to the plugin configuration guide about test result visualization.
(Note: The new screenshots should be retaken because of the missing diagnostic and some cosmetic details.)

Testing done

N/A. The only affected file is CONFIGDOC.md.

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[mw-hrastega]

Hi @mw-kapilg, I updated the doc pull request based on your recent fixes. This pull request is now ready for your review. Thanks.

[mw-kapilg]

Thanks for updating the doc Houman! Added some suggestions/queries in comments

[mw-kapilg]

Thanks for updating the doc, Houman! LGTM