Improves code location matching for some tests,
like where expecto testList groupings are composed into another testList.
Enables location-based features (like gutter status) for those tests.

I used suffix matching to locate tests in code where the code and
result structure don't match. This adds recursively matching the children
of those matched fragments so they also show locations
after initial location matchin, but we don't have to do more suffix
matching than neccessary.