Add incremental coverage report for changed code to MR widget
Description
We report code coverage on merge requests, and have a separate issue to highlight code changes in an MR that don't have coverage, but how about reporting on the code coverage of the specific code added or modified by the MR? i.e. it's nice to know that the code coverage didn't go down, but it would be even better to see that the MR has 100% of its modified code tested. This is especially important for regressions, for example, where keeping to the average code coverage really isn't sufficient.
Proposal
Links / references
Edited by Jason Yavorska