fix and reenable coverage tracking for dartdoc #3375
Description
While I didn't use it frequently, when I did it was very helpful for highlighting unused and untested code. Turning this on could be a win if we can get it to work.
{{ message }}
While I didn't use it frequently, when I did it was very helpful for highlighting unused and untested code. Turning this on could be a win if we can get it to work.