Create tests for issues count query

The following discussion from !196376 (merged) should be addressed:

• @fernanda.toledo started a discussion: (+6 comments)

  Thank you for working on this fix @poojaghanghas479!

  We should only need the changes you added to the query file to fix this issue, as we don't have the custom fields filters on the dashboard/issues page due to the lack of group context. 😄

  Could you also add a Changelog: fixed to the first commit, please?

  Could you review these, please?