MR Review: Show changed files for the MR
Problem to solve
As a part of MR review, users need to see what files changed. It's the initial step in selecting a chagned file and inspecting the MR diff view.
Building on top of the work in #243 (closed) we would extend the MR items in the tree view as per the screenshot. For each MR user can click on the MR and see an item representing the description and all changed files.
- We would have a chance to deside what icons do we want to show and we could also redesign the tree structure (e.g. grouping issue queries and MR queries)
- The current implementation of the tree view is mainly untested (except for a few integration tests) and it is not extensible in its current form. We will need to refactor the tree view a bit before we can start building on top of it.